Active NPI 1487651337 Individual Practitioner Male Practitioner

Dr. Daniel J Grzegorek , DO

Internal Medicine • Willowbrook, IL

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Daniel Grzegorek, DO is a certified Internal Medicine practicing in Willowbrook, IL. With approximately 34 years of clinical experience since graduating from Chicago College Of Osteopathy in 1992, Dr. Grzegorek delivers high-quality medical care to the local community at 6733 KINGERY HWY.

Dr. Grzegorek is affiliated with Dupage Medical Group Ltd and accepts Medicare assignment . Telehealth and virtual consultation options are available for eligible patients.

Frequently performed procedures and clinical services include established patient outpatient office visit, insertion of needle into vein for collection of blood sample, blood test, comprehensive group of blood chemicals. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

6733 Kingery Hwy

Willowbrook, IL 605275142

Telephone 6303254049

Associated Practice Facility / Clinic

🏢 The 83rd. Professional Group Facility NPI 1245454479

Medicare Profile & Education

Medical School

Chicago College Of Osteopathy

Graduation Year

1992

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Willowbrook, IL

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

34 Yrs -3.2 yrs vs City Avg

City Avg: 37.2 Yrs

State Avg: 28.9 Yrs

Regional Practice Density

7 Specialists

Practicing in Willowbrook, IL (7544 Statewide)

Telehealth Adoption Rate

28.6% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

57.1% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Grzegorek (34 Years) 34 Yrs

Willowbrook Specialty Average (37.2 Years) 37.2 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
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	591	307	$229.00	$130.97
36415 Insertion of needle into vein for collection of blood sample	561	349	$20.00	$8.62
80053 Blood test, comprehensive group of blood chemicals	465	329	$55.00	$10.31
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	428	146	$146.00	$75.71
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	366	239	$35.00	$16.72
84443 Blood test, thyroid stimulating hormone (TSH)	364	321	$86.00	$16.42
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	353	299	$40.00	$7.61
80061 Blood test, lipids (cholesterol and triglycerides)	352	317	$69.00	$13.09
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	326	326	$229.00	$132.87
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	264	118	$190.00	$109.58
99306 Initial nursing facility visit, typically 45 minutes per day	209	184	$357.00	$184.37
99213 Established patient office or other outpatient visit, typically 15 minutes	202	156	$157.00	$93.27
83036 Hemoglobin A1C level	171	89	$50.00	$9.52
82570 Creatinine level to test for kidney function or muscle injury	86	72	$27.00	$5.08
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	83	27	$146.00	$75.79
82043 Urine microalbumin (protein) level	83	70	$30.00	$5.66
G0103 Prostate cancer screening; prostate specific antigen test (psa)	68	68	$52.00	$18.92
G0008 Administration of influenza virus vaccine	50	49	$55.00	$33.45
99315 Nursing facility discharge day management, 30 minutes or less	45	44	$154.00	$82.98
90653 Vaccine for influenza for injection into muscle	45	45	$251.00	$81.82
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	39	39	$851.00	$291.14
G0009 Administration of pneumococcal vaccine	39	39	$55.00	$33.45
80048 Blood test, basic group of blood chemicals (calcium, total)	29	25	$44.00	$8.29
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	29	17	$190.00	$109.46
99442 Telephone medical discussion with physician, 11-20 minutes	28	20	$179.00	$92.82
84439 Thyroxine (thyroid chemical), free	26	21	$46.00	$8.84
93000 Routine ekg using at least 12 leads including interpretation and report	25	25	$72.00	$14.83
84153 Psa (prostate specific antigen) measurement, total	20	19	$94.00	$18.02
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	17	14	$284.00	$135.49
82306 Vitamin d-3 level	15	14	$152.00	$29.01
84550 Uric acid level, blood	15	15	$23.00	$4.43
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test	14	14	$33.00	$6.34
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	12	11	$114.00	$52.49
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	11	11	$359.00	$172.97

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	549	213	$146.00	$76.92
36415 Insertion of needle into vein for collection of blood sample	520	328	$20.00	$8.27
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	491	285	$229.00	$132.56
80053 Blood test, comprehensive group of blood chemicals	417	310	$55.00	$10.31
84443 Blood test, thyroid stimulating hormone (TSH)	330	288	$86.00	$16.46
80061 Blood test, lipids (cholesterol and triglycerides)	317	282	$69.00	$13.12
99306 Initial nursing facility visit, typically 45 minutes per day	316	279	$357.00	$187.27
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	306	168	$190.00	$109.68
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	288	259	$40.00	$7.54
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	283	283	$229.00	$133.37
99213 Established patient office or other outpatient visit, typically 15 minutes	209	164	$157.00	$93.54
83036 Hemoglobin A1C level	134	73	$50.00	$9.46
82570 Creatinine level to test for kidney function or muscle injury	69	64	$27.00	$5.08
82043 Urine microalbumin (protein) level	65	61	$30.00	$5.66
G0008 Administration of influenza virus vaccine	62	62	$55.00	$32.05
90694 Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage	61	61	$103.00	$75.81
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	58	37	$146.00	$76.92
G0103 Prostate cancer screening; prostate specific antigen test (psa)	43	43	$52.00	$18.92
84439 Thyroxine (thyroid chemical), free	42	34	$46.00	$8.84
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test	41	41	$33.00	$6.34
99442 Telephone medical discussion with physician, 11-20 minutes	38	34	$179.00	$93.51
99307 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes	36	16	$93.00	$40.74
80048 Blood test, basic group of blood chemicals (calcium, total)	31	24	$44.00	$7.17
93000 Routine ekg using at least 12 leads including interpretation and report	28	28	$72.00	$15.17
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	26	17	$190.00	$109.64
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	25	25	$851.00	$282.50
G0009 Administration of pneumococcal vaccine	25	25	$55.00	$32.05
84153 Psa (prostate specific antigen) measurement, total	22	20	$94.00	$18.02
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	21	17	$114.00	$54.09
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	19	19	$352.00	$170.73
99315 Nursing facility discharge day management, 30 minutes or less	17	17	$154.00	$84.12
99306 Initial nursing facility visit, typically 45 minutes per day	15	15	$357.00	$187.15
G0472 Hepatitis c antibody screening, for individual at high risk and other covered indication(s)	14	14	$139.00	$45.42

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	543	281	$229.00	$133.54
36415 Insertion of needle into vein for collection of blood sample	495	302	$20.00	$2.95
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	485	179	$146.00	$71.48
80053 Blood test, comprehensive group of blood chemicals	375	268	$55.00	$10.41
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	359	162	$190.00	$93.89
99213 Established patient office or other outpatient visit, typically 15 minutes	307	206	$157.00	$94.93
84443 Blood test, thyroid stimulating hormone (TSH)	282	242	$86.00	$16.60
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	276	233	$40.00	$7.67
80061 Blood test, lipids (cholesterol and triglycerides)	268	234	$69.00	$13.19
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	264	264	$229.00	$137.04
99306 Initial nursing facility visit, typically 45 minutes per day	257	229	$357.00	$169.72
83036 Hemoglobin A1C level	175	91	$50.00	$9.54
82570 Creatinine level to test for kidney function or muscle injury	81	75	$27.00	$5.12
82043 Urine microalbumin (protein) level	80	74	$30.00	$5.71
G0008 Administration of influenza virus vaccine	76	74	$55.00	$30.69
90694 Influenza vaccine, quadrivalent inactivated, 0.5 ml dosage	69	69	$103.00	$70.25
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	61	25	$146.00	$71.61
G0103 Prostate cancer screening; prostate specific antigen test (psa)	54	54	$52.00	$19.04
99442 Telephone medical discussion with physician, 11-20 minutes	48	42	$179.00	$95.16
80048 Blood test, basic group of blood chemicals (calcium, total)	40	35	$44.00	$8.34
99307 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes	39	12	$93.00	$45.17
84439 Thyroxine (thyroid chemical), free	36	28	$46.00	$8.92
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	34	16	$190.00	$93.95
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	28	26	$114.00	$55.64
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test	25	25	$33.00	$6.41
93000 Routine ekg using at least 12 leads including interpretation and report	23	23	$72.00	$14.80
99315 Nursing facility discharge day management, 30 minutes or less	23	22	$154.00	$74.84
G0009 Administration of pneumococcal vaccine	23	23	$55.00	$31.23
84153 Psa (prostate specific antigen) measurement, total	22	21	$94.00	$18.16
G0472 Hepatitis c antibody screening, for individual at high risk and other covered indication(s)	19	19	$139.00	$45.98
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	16	16	$359.00	$176.44
82607 Cyanocobalamin (vitamin B-12) level	14	12	$77.00	$14.92
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	14	14	$340.00	$174.86
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use	13	13	$851.00	$278.05
82746 Folic acid level	12	11	$77.00	$14.55
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	11	11	$352.00	$175.39
G0328 Colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous	11	11	$45.00	$17.77

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	528	172	$190.00	$96.55
36415 Insertion of needle into vein for collection of blood sample	520	334	$20.00	$2.97
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	476	271	$229.00	$138.24
80053 Blood test, comprehensive group of blood chemicals	392	300	$55.00	$10.54
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	350	162	$146.00	$73.48
84443 Blood test, thyroid stimulating hormone (TSH)	322	277	$86.00	$16.76
99213 Established patient office or other outpatient visit, typically 15 minutes	308	218	$157.00	$98.16
80061 Blood test, lipids (cholesterol and triglycerides)	288	264	$69.00	$13.31
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	283	246	$40.00	$7.75
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	250	250	$229.00	$142.62
99306 Initial nursing facility visit, typically 45 minutes per day	238	204	$357.00	$175.63
83036 Hemoglobin A1C level	178	94	$50.00	$9.71
G0008 Administration of influenza virus vaccine	96	96	$55.00	$17.98
90662 Influenza vaccine split virus, preservative free	96	96	$106.00	$65.17
82570 Creatinine level to test for kidney function or muscle injury	77	69	$27.00	$5.18
82043 Urine microalbumin (protein) level	73	68	$30.00	$5.78
G0103 Prostate cancer screening; prostate specific antigen test (psa)	65	65	$52.00	$19.31
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test	54	54	$33.00	$6.47
84439 Thyroxine (thyroid chemical), free	51	39	$46.00	$9.02
85610 Blood test, clotting time	49	11	$20.00	$3.47
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	47	39	$307.00	$194.74
80048 Blood test, basic group of blood chemicals (calcium, total)	32	25	$44.00	$8.46
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	32	17	$146.00	$73.41
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	31	31	$352.00	$180.04
G0472 Hepatitis c antibody screening, for individual at high risk and other covered indication(s)	27	27	$139.00	$46.35
84550 Uric acid level, blood	25	20	$23.00	$4.52
84153 Psa (prostate specific antigen) measurement, total	23	21	$94.00	$18.39
99442 Telephone medical discussion with physician, 11-20 minutes	23	20	$129.26	$95.12
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	22	19	$114.00	$56.94
G0009 Administration of pneumococcal vaccine	22	22	$55.00	$17.94
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	16	16	$361.00	$124.80
93000 Routine ekg using at least 12 leads including interpretation and report	14	14	$72.00	$16.13
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	13	12	$190.00	$96.46
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	13	13	$359.00	$180.85
U0003 Infectious agent detection by nucleic acid (dna or rna); severe acute respiratory syndrome coronavirus 2 (sars-cov-2) (coronavirus disease [covid-19]), amplified probe technique, making use of high throughput technologies as described by cms-2020-01-r	12	12	$300.00	$75.00
86769 Measure of severe acute respiratory syndrome coronavirus 2 (covid-19) antibody	12	12	$126.00	$42.13

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	497	160	$146.00	$73.99
36415 Insertion of needle into vein for collection of blood sample	370	246	$20.00	$2.98
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	364	217	$229.00	$116.15
80053 Blood test, comprehensive group of blood chemicals	288	219	$55.00	$10.51
99213 Established patient office or other outpatient visit, typically 15 minutes	253	165	$157.00	$80.68
84443 Blood test, thyroid stimulating hormone (TSH)	225	202	$86.00	$16.73
80061 Blood test, lipids (cholesterol and triglycerides)	222	201	$69.00	$13.33
99306 Initial nursing facility visit, typically 45 minutes per day	212	180	$357.00	$177.62
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	211	187	$40.00	$7.71
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	187	187	$229.00	$124.45
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	183	100	$190.00	$97.66
83036 Hemoglobin A1C level	138	79	$50.00	$9.67
G0008 Administration of influenza virus vaccine	125	118	$55.00	$17.71
90662 Influenza vaccine split virus, preservative free	121	115	$106.00	$60.28
82043 Urine microalbumin (protein) level	59	56	$30.00	$5.76
82570 Creatinine level to test for kidney function or muscle injury	59	56	$27.00	$5.16
G0009 Administration of pneumococcal vaccine	53	53	$55.00	$17.68
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	49	48	$94.00	$49.25
G0103 Prostate cancer screening; prostate specific antigen test (psa)	44	44	$52.00	$19.24
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	31	31	$330.42	$118.81
99442 Telephone medical discussion with physician, 11-20 minutes	31	28	$151.61	$80.57
80048 Blood test, basic group of blood chemicals (calcium, total)	31	27	$44.00	$8.16
85027 Complete blood cell count (red cells, white blood cell, platelets), automated test	31	31	$33.00	$6.43
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	28	28	$352.00	$182.53
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	23	19	$307.00	$157.29
U0003 Infectious agent detection by nucleic acid (dna or rna); severe acute respiratory syndrome coronavirus 2 (sars-cov-2) (coronavirus disease [covid-19]), amplified probe technique, making use of high throughput technologies as described by cms-2020-01-r	23	23	$300.00	$100.00
90670 Pneumococcal vaccine for injection into muscle	22	22	$254.00	$224.74
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	22	20	$43.00	$24.97
86769 Measure of severe acute respiratory syndrome coronavirus 2 (covid-19) antibody	20	20	$126.00	$42.13
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	18	18	$340.00	$178.45
86803 Hepatitis c antibody measurement	18	18	$73.00	$14.21
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	18	16	$114.00	$57.40
84439 Thyroxine (thyroid chemical), free	15	12	$46.00	$9.01
84153 Psa (prostate specific antigen) measurement, total	14	13	$94.00	$18.34
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	11	11	$359.00	$177.42
93000 Routine ekg using at least 12 leads including interpretation and report	11	11	$72.00	$18.60

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36415 Insertion of needle into vein for collection of blood sample	413	235	$20.00	$2.94
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	409	213	$229.00	$115.12
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	408	161	$146.00	$73.15
99213 Established patient office or other outpatient visit, typically 15 minutes	314	176	$157.00	$78.97
80053 Blood test, comprehensive group of blood chemicals	310	220	$55.00	$11.50
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	245	198	$40.00	$8.46
84443 Blood test, thyroid stimulating hormone (TSH)	229	202	$86.00	$18.30
80061 Blood test, lipids (cholesterol and triglycerides)	222	196	$69.00	$14.58
99306 Initial nursing facility visit, typically 45 minutes per day	218	183	$357.00	$176.19
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	191	191	$229.00	$123.71
83036 Hemoglobin A1C level	150	78	$50.00	$10.57
G0008 Administration of influenza virus vaccine	133	133	$55.00	$17.39
90662 Influenza vaccine split virus, preservative free	127	127	$106.00	$54.75
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	68	42	$190.00	$97.34
99307 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes	68	16	$93.00	$46.71
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	66	66	$94.00	$47.38
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	56	14	$151.00	$77.33
G0009 Administration of pneumococcal vaccine	51	51	$55.00	$17.39
82043 Urine microalbumin (protein) level	47	42	$30.00	$6.29
82570 Creatinine level to test for kidney function or muscle injury	47	42	$27.00	$5.63
G0103 Prostate cancer screening; prostate specific antigen test (psa)	43	43	$52.00	$20.03
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	35	35	$124.00	$110.48
80048 Blood test, basic group of blood chemicals (calcium, total)	31	26	$44.00	$9.21
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	25	25	$352.00	$182.43
90670 Pneumococcal vaccine for injection into muscle	16	16	$254.00	$209.77
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	15	14	$114.00	$56.69
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	15	15	$359.00	$175.53
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	13	13	$431.00	$215.04
99239 Hospital discharge day management, more than 30 minutes	12	12	$225.00	$113.64
93000 Routine ekg using at least 12 leads including interpretation and report	12	12	$72.00	$18.30
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	11	11	$284.00	$138.31

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	441	221	$229.00	$112.42
36415 Insertion of needle into vein for collection of blood sample	395	234	$20.00	$2.94
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	385	133	$146.00	$72.63
80053 Blood test, comprehensive group of blood chemicals	310	222	$55.00	$12.67
99213 Established patient office or other outpatient visit, typically 15 minutes	269	164	$157.00	$76.83
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	222	195	$40.00	$9.40
80061 Blood test, lipids (cholesterol and triglycerides)	220	193	$69.00	$16.14
84443 Blood test, thyroid stimulating hormone (TSH)	215	191	$86.00	$20.25
99306 Initial nursing facility visit, typically 45 minutes per day	203	166	$357.00	$174.14
83036 Hemoglobin A1C level	157	72	$50.00	$11.75
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	147	147	$229.00	$122.44
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	138	28	$151.00	$76.49
G0008 Administration of influenza virus vaccine	126	124	$55.00	$21.46
90662 Influenza vaccine split virus, preservative free	118	116	$102.34	$52.01
G0009 Administration of pneumococcal vaccine	92	92	$55.00	$21.46
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	68	68	$124.00	$105.59
99307 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes	53	18	$93.00	$46.79
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	46	46	$352.00	$180.04
G0103 Prostate cancer screening; prostate specific antigen test (psa)	38	38	$52.00	$22.26
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	37	24	$218.00	$109.46
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	37	32	$431.00	$213.35
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	36	36	$94.00	$46.42
80048 Blood test, basic group of blood chemicals (calcium, total)	33	25	$44.00	$10.23
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	29	24	$190.00	$96.19
99239 Hospital discharge day management, more than 30 minutes	25	21	$225.00	$112.98
90670 Pneumococcal vaccine for injection into muscle	24	24	$254.00	$196.43
99238 Hospital discharge day management, 30 minutes or less	18	17	$155.00	$76.85
G0328 Colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous	15	15	$45.00	$19.25
81003 Automated urinalysis test	13	11	$12.00	$2.71
82306 Vitamin d-3 level	13	12	$152.00	$35.82
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	13	13	$307.00	$152.36
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	11	11	$340.00	$174.28

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
36415 Insertion of needle into vein for collection of blood sample	391	230	$20.00	$2.94
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	387	207	$229.00	$112.04
99308 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes	348	125	$146.00	$72.40
99213 Established patient office or other outpatient visit, typically 15 minutes	347	190	$157.00	$76.53
80053 Blood test, comprehensive group of blood chemicals	271	204	$55.00	$12.13
84443 Blood test, thyroid stimulating hormone (TSH)	225	188	$86.00	$22.59
85025 Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count	220	190	$40.00	$10.45
80061 Blood test, lipids (cholesterol and triglycerides)	206	186	$69.00	$14.39
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	192	45	$151.00	$75.06
99306 Initial nursing facility visit, typically 45 minutes per day	182	151	$357.00	$174.40
83036 Hemoglobin A1C level	161	74	$50.00	$13.05
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	126	126	$229.00	$121.30
G0008 Administration of influenza virus vaccine	104	101	$55.00	$26.65
90662 Influenza vaccine split virus, preservative free	94	91	$52.00	$47.72
99307 Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes	70	22	$93.00	$46.84
G0009 Administration of pneumococcal vaccine	57	57	$55.00	$26.65
G0438 Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit	49	49	$352.00	$178.71
90670 Pneumococcal vaccine for injection into muscle	41	41	$254.00	$185.74
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	38	27	$431.00	$204.64
G0103 Prostate cancer screening; prostate specific antigen test (psa)	36	36	$52.00	$24.73
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	34	22	$190.00	$95.64
80048 Blood test, basic group of blood chemicals (calcium, total)	33	26	$44.00	$11.09
99239 Hospital discharge day management, more than 30 minutes	33	28	$225.00	$112.88
99238 Hospital discharge day management, 30 minutes or less	29	20	$155.00	$71.72
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	27	17	$218.00	$106.42
93000 Routine ekg using at least 12 leads including interpretation and report	24	23	$72.00	$18.05
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	19	17	$114.00	$56.60
82306 Vitamin d-3 level	19	18	$152.00	$39.80
90732 Vaccine for pneumococcal polysaccharide for injection beneath the skin or into muscle, patient 2 years or older	18	18	$124.00	$95.90
84153 Psa (prostate specific antigen) measurement, total	16	16	$94.00	$24.73
81003 Automated urinalysis test	15	14	$12.00	$3.02
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	15	15	$359.00	$173.72
99305 Initial nursing facility care with moderate level of medical decision making, per day, if using time, at least 35 minutes	14	13	$284.00	$136.34
G0328 Colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous	14	14	$45.00	$21.38

Medical Specialties & State Licenses

CMS Verified: 2023-08-08

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License IL 036-089211

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

036089211 (IL)

Hospital & Practice Group Affiliations

Dupage Medical Group Ltd

40 S Clay St, Hinsdale, IL 605213257

Dupage Medical Group Ltd

430 Pennsylvania Ave, Glen Ellyn, IL 601374464

Phone: 6304699200

Dupage Medical Group Ltd

30 Stratford Dr, Bloomingdale, IL 601082201

Phone: 6308932210

Dupage Medical Group Ltd

430 Warrenville Rd, Lisle, IL 605321348

Phone: 6304326180

Dupage Medical Group Ltd

1325 N Meacham Rd, Schaumburg, IL 601734824

Phone: 6304699200

Dupage Medical Group Ltd

6733 Kingery Hwy, Willowbrook, IL 605275142

Phone: 6303254049

Dupage Medical Group Ltd

2100 Glenwood Ave, Joliet, IL 604355487

Phone: 8157252121

Dupage Medical Group Ltd

17495 La Grange Rd, Tinley Park, IL 604877581

Phone: 7082267000

Practice Associates & Co-Workers

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

1 Associated Practitioners

Pamela Piszczek , APRN, FNP-C

Nurse Practitioner

NPI 1710528740

Advanced Practice Registered Nurse, Family Nurse Practitioner (Certified)

Career & Practice History Timeline

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

7 Historical Events

📍

Updated Business Mailing Address August 08, 2023

Registered at PO BOX 713260, CHICAGO, IL 606771260 (Tel: 6304699200)

✅

NPI Profile Active March 23, 2012

NPI status registered as active in NPPES database

📍

Updated Practice Location March 23, 2012

Registered at 6733 KINGERY HWY, WILLOWBROOK, IL 605275142 (Tel: 6303254049)

📍

Updated Business Mailing Address March 23, 2012

Registered at 1860 PAYSPHERE CIR, CHICAGO, IL 606740001

👤

Provider Name / Credentials Updated March 23, 2012

Recorded as DANIEL GRZEGOREK, D.O.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) March 23, 2012

Internal Medicine (License #036-089211 in IL)

🟢

Initial NPI Registration & Enumeration July 07, 2005

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1487651337

Entity Type:

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

Enumeration Date: July 07, 2005

Last Update: August 08, 2023

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 713260

Chicago, IL 606771260

Phone: 6304699200

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.