Active NPI 1629087325 Individual Practitioner Male Practitioner

Dr. Nathan R. Walker , MD

Internal Medicine • Champaign, IL

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Nathan Walker, MD is a certified Internal Medicine practicing in Champaign, IL. With approximately 24 years of clinical experience since graduating from University Of Cincinnati College Of Medicine in 2002, Dr. Walker delivers high-quality medical care to the local community at 1801 W WINDSOR RD.

Dr. Walker is affiliated with Christie Clinic, Pllc and accepts Medicare assignment . Telehealth and virtual consultation options are available for eligible patients.

Frequently performed procedures and clinical services include injection, denosumab, 1 mg, visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's, established patient outpatient office visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

1801 W Windsor Rd

Champaign, IL 618226217

Telephone 2173662660

Fax 2173666106

Associated Practice Facility / Clinic

🏢 Christie Clinic, Pllc Facility NPI 1720678931

Medicare Profile & Education

Medical School

University Of Cincinnati College Of Medicine

Graduation Year

2002

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Champaign, IL

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

24 Yrs +0.5 yrs vs City Avg

City Avg: 23.5 Yrs

State Avg: 28.9 Yrs

Regional Practice Density

32 Specialists

Practicing in Champaign, IL (7544 Statewide)

Telehealth Adoption Rate

37.5% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

73.9% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Walker (24 Years) 24 Yrs

Champaign Specialty Average (23.5 Years) 23.5 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	1,860	17	$70.00	$25.56
G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's	956	441	$49.00	$15.83
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	898	442	$252.00	$121.02
36415 Insertion of needle into vein for collection of blood sample	700	391	$32.00	$8.57
80053 Blood test, comprehensive group of blood chemicals	548	371	$111.00	$10.30
99213 Established patient office or other outpatient visit, typically 15 minutes	487	287	$171.00	$84.84
83036 Hemoglobin A1C level	473	356	$96.00	$9.44
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	465	356	$67.00	$7.58
84443 Blood test, thyroid stimulating hormone (TSH)	402	352	$151.00	$16.37
80061 Blood test, lipids (cholesterol and triglycerides)	370	343	$190.00	$12.99
82306 Vitamin d-3 level	239	233	$286.00	$28.78
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	162	29	$3.00	$0.96
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	159	159	$301.00	$123.52
84153 Psa (prostate specific antigen) measurement, total	133	128	$172.00	$18.02
82043 Urine microalbumin (protein) level	132	110	$117.00	$5.50
82570 Creatinine level to test for kidney function or muscle injury	132	110	$61.00	$4.94
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	115	43	$57.00	$13.24
84439 Thyroxine (thyroid chemical), free	88	75	$106.00	$8.77
99490 Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month	85	85	$122.00	$60.12
86235 Measurement of antibody for assessment of autoimmune disorder, any method	73	17	$121.00	$17.57
G0103 Prostate cancer screening; prostate specific antigen test (psa)	70	70	$141.00	$18.92
82607 Cyanocobalamin (vitamin B-12) level	62	58	$153.00	$14.78
G0008 Administration of influenza virus vaccine	61	60	$32.00	$31.15
82728 Ferritin (blood protein) level	60	51	$129.00	$13.36
90662 Influenza vaccine split virus, preservative free	56	55	$184.00	$80.94
84481 Thyroid hormone, t3 measurement, free	50	49	$200.00	$16.29
99439 Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month	44	34	$105.00	$45.81
84550 Uric acid level, blood	42	41	$40.00	$4.43
99495 Transitional care management services for problem of at least moderate complexity	39	33	$525.00	$191.51
84403 Testosterone (hormone) level, total	37	30	$170.00	$25.29
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	35	35	$453.00	$157.56
81000 Manual urinalysis test with examination using microscope, non-automated	35	30	$40.00	$3.94
91320 Sarscv2 vac 30mcg trs-suc im	28	28	$321.00	$151.04
90480 Admn sarscov2 vacc 1 dose	28	28	$51.00	$41.54
83550 Iron binding capacity	25	22	$60.00	$8.57
83540 Iron level	25	22	$39.00	$6.34
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	25	25	$722.00	$290.24
G0009 Administration of pneumococcal vaccine	25	25	$32.00	$31.15
20610 Aspiration and/or injection of fluid from large joint	24	17	$402.50	$67.96
83970 Parathormone (parathyroid hormone) level	24	20	$325.00	$40.45
86140 Measurement C-reactive protein for detection of infection or inflammation	24	21	$64.00	$5.08
82670 Measurement of total estradiol (hormone)	19	17	$164.00	$27.38
86431 Rheumatoid factor level	18	17	$64.00	$5.56
86225 Measurement of dna antibody, native or double stranded	18	17	$137.00	$13.47
86376 Microsomal antibodies (autoantibody) measurement	17	17	$128.00	$13.96
82310 Calcium level, total	16	12	$46.00	$5.06
99406 Smoking and tobacco use intermediate counseling, greater than 3 minutes up to 10 minutes	16	11	$54.00	$13.13
85652 Red blood cell sedimentation rate, to detect inflammation, automated	16	13	$49.00	$2.65

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	1,860	21	$65.00	$23.16
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	1,065	505	$252.00	$124.42
36415 Insertion of needle into vein for collection of blood sample	746	423	$32.00	$8.38
80053 Blood test, comprehensive group of blood chemicals	643	417	$111.00	$10.33
83036 Hemoglobin A1C level	509	377	$96.00	$9.50
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	502	398	$67.00	$7.61
84443 Blood test, thyroid stimulating hormone (TSH)	399	364	$151.00	$16.46
80061 Blood test, lipids (cholesterol and triglycerides)	392	372	$190.00	$13.12
99213 Established patient office or other outpatient visit, typically 15 minutes	371	238	$171.00	$86.58
82306 Vitamin d-3 level	355	317	$286.00	$29.01
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	216	36	$3.09	$1.02
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	156	156	$290.00	$126.28
84153 Psa (prostate specific antigen) measurement, total	152	144	$172.00	$18.02
82570 Creatinine level to test for kidney function or muscle injury	122	115	$61.00	$5.05
82043 Urine microalbumin (protein) level	121	114	$117.00	$5.64
84439 Thyroxine (thyroid chemical), free	117	104	$106.00	$8.84
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	102	54	$57.00	$13.07
84481 Thyroid hormone, t3 measurement, free	96	93	$200.00	$16.60
82607 Cyanocobalamin (vitamin B-12) level	90	86	$153.00	$14.78
J1100 Injection, dexamethasone sodium phosphate, 1 mg	76	13	$2.00	$0.12
81000 Manual urinalysis test with examination using microscope, non-automated	63	50	$40.00	$3.94
82728 Ferritin (blood protein) level	62	53	$129.00	$13.36
G0103 Prostate cancer screening; prostate specific antigen test (psa)	54	54	$141.00	$18.92
G0008 Administration of influenza virus vaccine	52	51	$32.00	$29.66
86235 Measurement of antibody for assessment of autoimmune disorder, any method	50	13	$121.00	$17.57
90662 Influenza vaccine split virus, preservative free	50	49	$175.00	$71.52
99495 Transitional care management services for problem of at least moderate complexity	45	41	$525.00	$198.29
84550 Uric acid level, blood	42	40	$40.00	$4.43
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	38	38	$437.00	$162.22
87086 Bacterial colony count, urine	38	34	$82.00	$7.91
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	34	15	$5.00	$1.65
84403 Testosterone (hormone) level, total	33	30	$170.00	$25.29
86140 Measurement C-reactive protein for detection of infection or inflammation	31	29	$64.00	$5.07
83550 Iron binding capacity	29	27	$60.00	$8.57
83540 Iron level	29	27	$39.00	$6.34
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	29	29	$710.00	$281.05
20610 Aspiration and/or injection of fluid from large joint	28	22	$406.61	$68.18
G0009 Administration of pneumococcal vaccine	28	28	$32.00	$29.66
83970 Parathormone (parathyroid hormone) level	25	21	$325.00	$40.45
99406 Smoking and tobacco use intermediate counseling, greater than 3 minutes up to 10 minutes	22	17	$54.00	$13.27
90480 Admn sarscov2 vacc 1 dose	21	21	$51.00	$39.55
91320 Sarscv2 vac 30mcg trs-suc im	21	21	$321.00	$128.48
82670 Measurement of total estradiol (hormone)	20	19	$164.00	$27.38
82310 Calcium level, total	19	13	$46.00	$5.06
86376 Microsomal antibodies (autoantibody) measurement	16	16	$128.00	$14.26
85652 Red blood cell sedimentation rate, to detect inflammation, automated	16	16	$49.00	$2.65
86431 Rheumatoid factor level	13	13	$64.00	$5.56
80048 Blood test, basic group of blood chemicals (calcium, total)	13	13	$95.00	$8.29
86225 Measurement of dna antibody, native or double stranded	13	13	$137.00	$13.47
82550 Creatine kinase (cardiac enzyme) level, total	12	11	$50.00	$6.38
0124A Fee covid-19 vac 13 res	12	12	$51.00	$39.55

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	3,000	29	$62.12	$21.31
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	1,042	483	$252.00	$125.08
36415 Insertion of needle into vein for collection of blood sample	766	427	$32.00	$2.96
80053 Blood test, comprehensive group of blood chemicals	635	417	$111.00	$10.40
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	519	395	$67.00	$7.64
83036 Hemoglobin A1C level	505	367	$96.00	$9.55
84443 Blood test, thyroid stimulating hormone (TSH)	417	380	$151.00	$16.51
99213 Established patient office or other outpatient visit, typically 15 minutes	397	234	$171.00	$87.38
80061 Blood test, lipids (cholesterol and triglycerides)	388	367	$190.00	$13.11
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	274	41	$4.00	$1.07
82306 Vitamin d-3 level	210	197	$286.00	$29.17
84439 Thyroxine (thyroid chemical), free	140	119	$106.00	$8.90
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	133	133	$279.00	$128.23
84481 Thyroid hormone, t3 measurement, free	132	116	$200.00	$16.59
G0103 Prostate cancer screening; prostate specific antigen test (psa)	127	127	$141.00	$19.05
82043 Urine microalbumin (protein) level	122	108	$117.00	$5.70
82570 Creatinine level to test for kidney function or muscle injury	122	108	$61.00	$5.11
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	121	53	$57.00	$13.55
J1100 Injection, dexamethasone sodium phosphate, 1 mg	96	14	$2.00	$0.11
G0008 Administration of influenza virus vaccine	69	69	$32.00	$28.01
84153 Psa (prostate specific antigen) measurement, total	68	66	$172.00	$17.83
82607 Cyanocobalamin (vitamin B-12) level	65	62	$153.00	$14.89
82728 Ferritin (blood protein) level	58	44	$129.00	$13.45
99495 Transitional care management services for problem of at least moderate complexity	49	40	$520.00	$201.78
G0009 Administration of pneumococcal vaccine	47	47	$32.00	$28.22
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	45	45	$421.00	$164.70
81000 Manual urinalysis test with examination using microscope, non-automated	44	39	$40.00	$3.97
84550 Uric acid level, blood	41	40	$40.00	$4.47
85610 Blood test, clotting time	41	11	$49.00	$4.23
20610 Aspiration and/or injection of fluid from large joint	38	24	$417.63	$67.82
83540 Iron level	37	30	$39.00	$6.39
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	36	36	$737.22	$278.84
83550 Iron binding capacity	36	29	$60.00	$8.64
90682 Influenza vaccine, quadrivalent derived from recombinant dna	34	34	$164.32	$68.54
90662 Influenza vaccine split virus, preservative free	33	33	$164.00	$68.24
83970 Parathormone (parathyroid hormone) level	29	25	$325.00	$40.77
84403 Testosterone (hormone) level, total	27	25	$170.00	$25.48
87088 Bacterial urine culture	27	23	$78.00	$7.98
86140 Measurement C-reactive protein for detection of infection or inflammation	24	24	$64.00	$5.11
82310 Calcium level, total	23	17	$46.00	$5.10
86376 Microsomal antibodies (autoantibody) measurement	22	22	$128.00	$14.31
0004A Fee covid-19 vac 1 res	18	18	$51.00	$37.20
85652 Red blood cell sedimentation rate, to detect inflammation, automated	17	17	$49.00	$2.67
82670 Measurement of total estradiol (hormone)	17	15	$164.00	$26.08
80048 Blood test, basic group of blood chemicals (calcium, total)	16	15	$95.00	$8.38

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	2,760	27	$58.00	$20.67
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	1,183	528	$252.00	$125.86
36415 Insertion of needle into vein for collection of blood sample	836	454	$32.00	$3.00
80053 Blood test, comprehensive group of blood chemicals	684	441	$111.00	$10.51
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	553	419	$67.00	$7.73
83036 Hemoglobin A1C level	514	376	$96.00	$9.62
84443 Blood test, thyroid stimulating hormone (TSH)	430	386	$151.00	$16.76
80061 Blood test, lipids (cholesterol and triglycerides)	386	359	$190.00	$13.32
99213 Established patient office or other outpatient visit, typically 15 minutes	293	201	$171.00	$87.99
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	252	48	$5.00	$1.16
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	152	52	$57.00	$12.87
84439 Thyroxine (thyroid chemical), free	152	127	$106.00	$9.02
G0103 Prostate cancer screening; prostate specific antigen test (psa)	151	151	$141.00	$19.31
84481 Thyroid hormone, t3 measurement, free	146	124	$200.00	$16.94
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	128	128	$402.00	$166.25
82570 Creatinine level to test for kidney function or muscle injury	106	95	$61.00	$5.18
82043 Urine microalbumin (protein) level	106	95	$117.00	$5.78
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	99	99	$265.00	$129.65
82306 Vitamin d-3 level	82	73	$286.00	$29.60
J1100 Injection, dexamethasone sodium phosphate, 1 mg	80	15	$2.00	$0.12
82728 Ferritin (blood protein) level	58	48	$129.00	$13.63
G0008 Administration of influenza virus vaccine	55	55	$32.00	$16.21
82607 Cyanocobalamin (vitamin B-12) level	50	50	$153.00	$15.08
90662 Influenza vaccine split virus, preservative free	50	50	$142.00	$65.17
99495 Transitional care management services for problem of at least moderate complexity	48	40	$520.00	$202.25
84153 Psa (prostate specific antigen) measurement, total	44	40	$172.00	$18.39
81000 Manual urinalysis test with examination using microscope, non-automated	44	37	$40.00	$3.95
84550 Uric acid level, blood	44	41	$40.00	$4.52
83550 Iron binding capacity	43	36	$60.00	$8.74
83540 Iron level	43	36	$39.00	$6.47
G0009 Administration of pneumococcal vaccine	40	39	$32.00	$16.20
87088 Bacterial urine culture	37	29	$78.00	$8.09
20610 Aspiration and/or injection of fluid from large joint	35	32	$364.71	$63.21
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	28	28	$300.00	$125.06
99442 Telephone medical discussion with physician, 11-20 minutes	28	26	$230.00	$90.35
86140 Measurement C-reactive protein for detection of infection or inflammation	25	22	$64.00	$5.18
82670 Measurement of total estradiol (hormone)	25	21	$164.00	$27.94
84403 Testosterone (hormone) level, total	25	21	$170.00	$25.81
83970 Parathormone (parathyroid hormone) level	25	19	$325.00	$41.28
85652 Red blood cell sedimentation rate, to detect inflammation, automated	22	22	$49.00	$2.70
80048 Blood test, basic group of blood chemicals (calcium, total)	20	20	$95.00	$8.46
86376 Microsomal antibodies (autoantibody) measurement	19	19	$128.00	$14.55
82310 Calcium level, total	17	15	$46.00	$5.16
90670 Pneumococcal vaccine for injection into muscle	14	14	$606.00	$240.58
82565 Blood creatinine level	12	11	$38.00	$5.12

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	2,400	25	$53.00	$19.58
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	1,032	536	$252.00	$106.86
36415 Insertion of needle into vein for collection of blood sample	785	462	$32.00	$2.98
80053 Blood test, comprehensive group of blood chemicals	658	451	$111.00	$10.50
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	534	425	$67.00	$7.72
83036 Hemoglobin A1C level	473	347	$96.00	$9.62
84443 Blood test, thyroid stimulating hormone (TSH)	458	395	$151.00	$16.71
99213 Established patient office or other outpatient visit, typically 15 minutes	409	259	$171.00	$71.74
80061 Blood test, lipids (cholesterol and triglycerides)	401	362	$190.00	$13.27
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	274	49	$7.00	$1.40
84439 Thyroxine (thyroid chemical), free	178	139	$106.00	$8.97
84481 Thyroid hormone, t3 measurement, free	163	125	$200.00	$16.76
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	152	152	$402.00	$165.99
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	126	57	$57.00	$13.69
G0103 Prostate cancer screening; prostate specific antigen test (psa)	118	118	$141.00	$19.13
99442 Telephone medical discussion with physician, 11-20 minutes	115	86	$155.33	$72.57
82570 Creatinine level to test for kidney function or muscle injury	105	93	$61.00	$5.15
82043 Urine microalbumin (protein) level	105	93	$117.00	$5.75
G0008 Administration of influenza virus vaccine	86	85	$29.70	$15.51
J1100 Injection, dexamethasone sodium phosphate, 1 mg	80	16	$2.00	$0.12
G0009 Administration of pneumococcal vaccine	71	71	$32.00	$16.03
82306 Vitamin d-3 level	65	63	$286.00	$29.42
84153 Psa (prostate specific antigen) measurement, total	62	58	$172.00	$18.19
82607 Cyanocobalamin (vitamin B-12) level	55	52	$153.00	$15.02
90670 Pneumococcal vaccine for injection into muscle	51	51	$567.00	$221.80
90682 Influenza vaccine, quadrivalent derived from recombinant dna	50	50	$141.00	$60.98
84550 Uric acid level, blood	47	42	$40.00	$4.50
82728 Ferritin (blood protein) level	43	39	$129.00	$13.24
81000 Manual urinalysis test with examination using microscope, non-automated	43	36	$40.00	$4.00
G0472 Hepatitis c antibody screening, for individual at high risk and other covered indication(s)	42	42	$146.00	$45.95
87088 Bacterial urine culture	41	34	$78.00	$8.04
83550 Iron binding capacity	41	36	$60.00	$8.48
83540 Iron level	41	36	$39.00	$6.28
99495 Transitional care management services for problem of at least moderate complexity	39	34	$520.00	$180.81
20610 Aspiration and/or injection of fluid from large joint	37	24	$391.62	$65.65
90662 Influenza vaccine split virus, preservative free	34	34	$124.29	$60.26
83970 Parathormone (parathyroid hormone) level	26	20	$325.00	$39.34
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	25	25	$292.00	$118.03
82670 Measurement of total estradiol (hormone)	24	17	$164.00	$27.73
86140 Measurement C-reactive protein for detection of infection or inflammation	21	18	$64.00	$5.18
85652 Red blood cell sedimentation rate, to detect inflammation, automated	16	15	$49.00	$2.70
86376 Microsomal antibodies (autoantibody) measurement	14	14	$128.00	$14.45
85379 Coagulation function measurement, d-dimer; quantitative	13	12	$143.00	$10.07
80048 Blood test, basic group of blood chemicals (calcium, total)	12	12	$95.00	$7.93
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	11	11	$258.00	$106.58
84484 Troponin (protein) analysis, quantitative	11	11	$113.00	$12.36

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	1,740	20	$49.00	$18.56
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	1,044	518	$252.24	$104.93
36415 Insertion of needle into vein for collection of blood sample	799	439	$29.00	$2.94
80053 Blood test, comprehensive group of blood chemicals	603	412	$111.00	$11.44
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	495	389	$67.00	$8.40
99213 Established patient office or other outpatient visit, typically 15 minutes	486	269	$171.00	$70.82
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	434	64	$7.00	$1.59
84443 Blood test, thyroid stimulating hormone (TSH)	422	362	$151.00	$18.20
83036 Hemoglobin A1C level	391	283	$96.00	$10.45
80061 Blood test, lipids (cholesterol and triglycerides)	326	313	$190.00	$14.45
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	242	66	$56.23	$14.54
J1100 Injection, dexamethasone sodium phosphate, 1 mg	220	29	$2.00	$0.11
84439 Thyroxine (thyroid chemical), free	214	173	$106.00	$9.78
G0008 Administration of influenza virus vaccine	155	155	$21.48	$13.27
84153 Psa (prostate specific antigen) measurement, total	151	144	$172.00	$19.79
90662 Influenza vaccine split virus, preservative free	147	147	$96.36	$54.39
84481 Thyroid hormone, t3 measurement, free	146	115	$200.00	$18.33
82043 Urine microalbumin (protein) level	129	116	$117.00	$6.28
82570 Creatinine level to test for kidney function or muscle injury	125	114	$61.00	$5.60
85610 Blood test, clotting time	97	25	$49.00	$4.28
82607 Cyanocobalamin (vitamin B-12) level	73	71	$153.00	$16.24
G0009 Administration of pneumococcal vaccine	61	61	$30.00	$15.85
82728 Ferritin (blood protein) level	59	53	$129.00	$14.85
81000 Manual urinalysis test with examination using microscope, non-automated	57	48	$40.00	$3.89
99495 Transitional care management services for problem of at least moderate complexity	51	49	$354.00	$159.83
20610 Aspiration and/or injection of fluid from large joint	47	36	$389.04	$63.77
83540 Iron level	46	43	$39.00	$7.05
84550 Uric acid level, blood	45	41	$40.00	$4.81
87088 Bacterial urine culture	42	34	$78.00	$8.66
83550 Iron binding capacity	38	35	$60.00	$9.52
90670 Pneumococcal vaccine for injection into muscle	37	37	$535.00	$209.67
85652 Red blood cell sedimentation rate, to detect inflammation, automated	35	34	$49.00	$2.86
82306 Vitamin d-3 level	34	33	$286.00	$32.23
93005 Routine electrocardiogram (ecg) using at least 12 leads with tracing	31	31	$116.00	$8.02
G0103 Prostate cancer screening; prostate specific antigen test (psa)	31	31	$141.00	$20.03
86140 Measurement C-reactive protein for detection of infection or inflammation	30	30	$64.00	$5.63
80048 Blood test, basic group of blood chemicals (calcium, total)	28	27	$95.00	$9.21
82670 Measurement of total estradiol (hormone)	26	20	$164.00	$29.36
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	25	25	$275.00	$110.92
83970 Parathormone (parathyroid hormone) level	22	20	$325.00	$44.94
G0472 Hepatitis c antibody screening, for individual at high risk and other covered indication(s)	21	21	$145.00	$45.42
87186 Evaluation of antimicrobial drug (antibiotic, antifungal, antiviral), microdilution or agar dilution	15	11	$76.00	$9.42
84484 Troponin (protein) analysis, quantitative	13	11	$113.00	$12.22
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	13	13	$258.00	$106.23
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	12	12	$50.00	$17.10
82310 Calcium level, total	11	11	$46.00	$5.62
86376 Microsomal antibodies (autoantibody) measurement	11	11	$128.00	$15.85
82550 Creatine kinase (cardiac enzyme) level, total	11	11	$50.00	$6.60

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
J0897 Injection, denosumab, 1 mg	1,621	18	$53.00	$17.94
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	995	498	$222.00	$103.65
36415 Insertion of needle into vein for collection of blood sample	795	412	$29.00	$2.94
99213 Established patient office or other outpatient visit, typically 15 minutes	504	293	$154.31	$69.32
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	472	359	$67.00	$9.38
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	440	68	$7.00	$1.79
84443 Blood test, thyroid stimulating hormone (TSH)	430	348	$151.00	$20.28
80053 Blood test, comprehensive group of blood chemicals	352	278	$111.00	$12.78
83036 Hemoglobin A1C level	345	239	$96.00	$11.56
80061 Blood test, lipids (cholesterol and triglycerides)	309	296	$190.00	$16.00
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	307	87	$56.00	$19.05
J1100 Injection, dexamethasone sodium phosphate, 1 mg	264	40	$1.00	$0.12
80048 Blood test, basic group of blood chemicals (calcium, total)	219	179	$95.00	$10.22
84439 Thyroxine (thyroid chemical), free	213	154	$106.00	$10.91
84481 Thyroid hormone, t3 measurement, free	164	114	$200.00	$20.50
84153 Psa (prostate specific antigen) measurement, total	156	144	$172.00	$21.83
80076 Liver function blood test panel	136	129	$99.00	$9.82
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	132	20	$17.00	$1.94
G0008 Administration of influenza virus vaccine	129	128	$13.53	$12.40
82043 Urine microalbumin (protein) level	125	109	$117.00	$6.98
82570 Creatinine level to test for kidney function or muscle injury	125	109	$61.00	$6.25
90662 Influenza vaccine split virus, preservative free	116	115	$73.71	$51.81
85610 Blood test, clotting time	106	17	$49.00	$4.75
G0009 Administration of pneumococcal vaccine	89	89	$23.00	$19.39
82607 Cyanocobalamin (vitamin B-12) level	83	80	$153.00	$17.70
82728 Ferritin (blood protein) level	79	63	$129.00	$16.49
83540 Iron level	58	50	$39.00	$7.83
81000 Manual urinalysis test with examination using microscope, non-automated	56	45	$40.00	$3.94
87088 Bacterial urine culture	49	39	$78.00	$9.79
20610 Aspiration and/or injection of fluid from large joint	49	31	$387.24	$62.57
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	46	46	$270.00	$105.59
90670 Pneumococcal vaccine for injection into muscle	43	43	$538.00	$199.30
84550 Uric acid level, blood	41	32	$40.00	$5.34
93005 Routine electrocardiogram (ecg) using at least 12 leads with tracing	38	35	$116.00	$7.76
82306 Vitamin d-3 level	36	30	$286.00	$35.82
82670 Measurement of total estradiol (hormone)	32	26	$164.00	$32.74
99495 Transitional care management services for problem of at least moderate complexity	32	31	$354.00	$158.51
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	24	24	$231.00	$105.33
83970 Parathormone (parathyroid hormone) level	22	17	$325.00	$49.94
87186 Evaluation of antimicrobial drug (antibiotic, antifungal, antiviral), microdilution or agar dilution	22	17	$76.00	$10.46
85652 Red blood cell sedimentation rate, to detect inflammation, automated	22	19	$49.00	$3.26
86140 Measurement C-reactive protein for detection of infection or inflammation	18	16	$64.00	$6.26
86376 Microsomal antibodies (autoantibody) measurement	17	16	$128.00	$17.60
83550 Iron binding capacity	14	13	$60.00	$10.57
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	14	14	$322.00	$141.40
83690 Lipase (fat enzyme) level	14	12	$78.00	$8.34
81002 Urinalysis, manual test	13	12	$31.00	$3.41
90686 Vaccine for influenza for administration into muscle, 0.5 ml dosage	13	13	$41.00	$18.65
87502 Detection test by nucleic acid for multiple types influenza virus	13	13	$240.00	$96.81
85379 Coagulation function measurement, d-dimer; quantitative	13	13	$143.00	$11.36
82248 Bilirubin level, direct	11	11	$41.00	$6.07

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	829	428	$202.49	$102.36
36415 Insertion of needle into vein for collection of blood sample	614	333	$29.00	$2.94
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	387	296	$65.00	$10.36
99213 Established patient office or other outpatient visit, typically 15 minutes	386	232	$140.00	$69.14
80048 Blood test, basic group of blood chemicals (calcium, total)	353	234	$93.00	$7.92
84443 Blood test, thyroid stimulating hormone (TSH)	329	277	$148.00	$22.27
83036 Hemoglobin A1C level	278	192	$93.00	$12.80
80061 Blood test, lipids (cholesterol and triglycerides)	255	241	$190.00	$13.25
J3301 Injection, triamcinolone acetonide, not otherwise specified, 10 mg	246	39	$6.00	$1.76
80076 Liver function blood test panel	226	196	$97.00	$6.59
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	153	41	$55.00	$23.89
80053 Blood test, comprehensive group of blood chemicals	129	118	$108.00	$11.85
J1100 Injection, dexamethasone sodium phosphate, 1 mg	120	17	$1.00	$0.12
84153 Psa (prostate specific antigen) measurement, total	116	108	$168.00	$23.94
G0008 Administration of influenza virus vaccine	116	116	$13.81	$13.45
90662 Influenza vaccine split virus, preservative free	106	106	$65.19	$47.60
G0009 Administration of pneumococcal vaccine	98	98	$23.00	$22.08
84439 Thyroxine (thyroid chemical), free	96	80	$103.00	$12.12
82570 Creatinine level to test for kidney function or muscle injury	93	80	$60.00	$6.84
82043 Urine microalbumin (protein) level	93	81	$114.00	$7.66
84481 Thyroid hormone, t3 measurement, free	78	65	$196.00	$15.25
90670 Pneumococcal vaccine for injection into muscle	73	73	$433.00	$181.29
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	61	11	$9.00	$2.59
82728 Ferritin (blood protein) level	46	38	$126.00	$18.06
81000 Manual urinalysis test with examination using microscope, non-automated	45	33	$39.00	$4.17
82607 Cyanocobalamin (vitamin B-12) level	42	37	$150.00	$20.27
99495 Transitional care management services for problem of at least moderate complexity	42	32	$354.00	$156.66
20610 Aspiration and/or injection of fluid from large joint	41	25	$471.22	$67.73
87088 Bacterial urine culture	34	25	$77.00	$10.88
83540 Iron level	30	27	$38.00	$8.48
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	29	29	$211.00	$95.67
82670 Measurement of total estradiol (hormone)	27	19	$160.00	$14.89
93005 Routine electrocardiogram (ecg) using at least 12 leads with tracing	25	23	$111.00	$7.72
84550 Uric acid level, blood	24	22	$40.00	$3.30
G0103 Prostate cancer screening; prostate specific antigen test (psa)	23	23	$141.00	$24.73
83970 Parathormone (parathyroid hormone) level	18	17	$318.00	$55.49
85652 Red blood cell sedimentation rate, to detect inflammation, automated	18	17	$48.00	$3.63
82310 Calcium level, total	14	14	$45.00	$4.13
86140 Measurement C-reactive protein for detection of infection or inflammation	14	13	$62.00	$6.96
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	13	13	$210.00	$104.83
82274 Stool analysis for blood, by fecal hemoglobin determination by immunoassay	13	13	$127.00	$21.38

Medical Specialties & State Licenses

CMS Verified: 2022-01-05

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License IL 036-114466

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

1629087325 1 (IL)

Commercial Insurance / Payer ID Medicare Group

279500 (IL)

Commercial Insurance / Payer ID Railroad Medicare

P00328910 (IL)

Hospital & Practice Group Affiliations

Christie Clinic, Pllc

1120 N Melvin St, Gibson City, IL 609361477

Phone: 2177844251

Christie Clinic, Pllc

1710 E Windsor Rd, Urbana, IL 618029564

Phone: 2173449440

Christie Clinic, Pllc

109 W University Ave, Champaign, IL 618203909

Phone: 2173665180

Christie Clinic, Pllc

209 W Borman Dr, Rantoul, IL 618663632

Phone: 2178939671

Christie Clinic, Pllc

300 N Main St, Tuscola, IL 619531406

Phone: 2172539258

Christie Clinic, Pllc

108 Robinson St, Danville, IL 618328515

Phone: 2174428611

Christie Clinic, Pllc

101 W University Ave, Champaign, IL 618203909

Phone: 2173661200

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

40 Associated Practitioners

Allen Thomas , PA-C

Physician Assistant

NPI 1033136635

Physician Assistant (Certified)

Dr. Prakash Thopiah , MD

Internal Medicine - Cardiovascular Disease

NPI 1033205208

Doctor of Medicine (M.D.)

Jane Valentine

Dietitian, Registered

NPI 1033520788

Whitney Kauffman , PA

Physician Assistant - Medical

NPI 1043593262

Physician Assistant

James Wallace , PA-C

Physician Assistant

NPI 1053539783

Physician Assistant (Certified)

Greta Obereiner , APN

Nurse Practitioner - Pediatrics

NPI 1053599423

Advanced Practice Nurse

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

7 Historical Events

📍

Updated Practice Location January 05, 2022

Registered at 1801 W WINDSOR RD, CHAMPAIGN, IL 618226217 (Tel: 2173662660)

✅

NPI Profile Active February 07, 2014

NPI status registered as active in NPPES database

📍

Updated Practice Location February 07, 2014

Registered at 501 N DUNLAP AVE, SAVOY, IL 618748403 (Tel: 2173662660)

📍

Updated Business Mailing Address February 07, 2014

Registered at 101 W UNIVERSITY AVE, CHAMPAIGN, IL 618203909 (Tel: 2173668107)

👤

Provider Name / Credentials Updated February 07, 2014

Recorded as NATHAN WALKER, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) February 07, 2014

Internal Medicine (License #036-114466 in IL)

🟢

Initial NPI Registration & Enumeration August 05, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

0 Reviews

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NPI Administrative Meta

NPI Number: 1629087325

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: August 05, 2006

Last Update: January 05, 2022

Sole Proprietor: No

Update or Correct Profile

Mailing Address

101 W University Ave

Champaign, IL 618203909

Phone: 2173668107

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.