Active NPI 1346210994 Individual Practitioner Male Practitioner

Dr. John A Walker , MD

Internal Medicine - Gastroenterology • Bend, OR

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. John Walker, MD is a certified Internal Medicine - Gastroenterology practicing in Bend, OR. With approximately 53 years of clinical experience since graduating from University Of Texas Southwestern Medical School At Dallas in 1973, Dr. Walker delivers high-quality medical care to the local community at 1342 NE MEDICAL CENTER DR STE 100.

Dr. Walker is affiliated with Centennial Medical Group Inc and accepts Medicare assignment.

Frequently performed procedures and clinical services include removal of polyps or growths of large bowel using an endoscope with mechanical snare, diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope, biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

1342 Ne Medical Center Dr Ste 100

Bend, OR 977015918

Telephone 5413882333

Fax 5413880930

Associated Practice Facility / Clinic

🏢 Neuromusculoskeletal Center Of The Cascades Pc Facility NPI 1760250278

Medicare Profile & Education

Medical School

University Of Texas Southwestern Medical School At Dallas

Graduation Year

1973

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine - Gastroenterology in Bend, OR

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

53 Yrs +25.7 yrs vs City Avg

City Avg: 27.3 Yrs

State Avg: 28.0 Yrs

Regional Practice Density

14 Specialists

Practicing in Bend, OR (284 Statewide)

Telehealth Adoption Rate

35.7% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

74.2% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Walker (53 Years) 53 Yrs

Bend Specialty Average (27.3 Years) 27.3 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
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	107	105	$809.00	$243.29
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	51	51	$389.00	$92.63
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	40	40	$439.00	$85.30
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	31	31	$587.00	$174.37
45380 Biopsy of large bowel using an endoscope	24	24	$637.00	$89.12
45378 Diagnostic exam of large bowel using a flexible endoscope	15	15	$589.00	$170.74
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	11	11	$509.00	$164.45

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	79	79	$652.43	$238.02
45380 Biopsy of large bowel using an endoscope	28	28	$515.56	$113.99
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	14	14	$314.48	$90.38
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	13	13	$431.97	$159.39
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	12	12	$334.52	$123.13

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	63	63	$652.43	$242.84
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	27	25	$334.52	$123.59
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	13	13	$431.97	$160.54
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	11	11	$355.11	$97.17

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	167	165	$1179.78	$245.72
99213 Established patient office or other outpatient visit, typically 15 minutes	73	70	$187.00	$89.04
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	73	73	$708.00	$90.74
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	70	70	$280.00	$106.30
45380 Biopsy of large bowel using an endoscope	65	65	$1065.00	$109.49
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	62	62	$415.00	$163.89
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	62	60	$905.00	$100.14
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	49	48	$275.00	$126.98
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	42	41	$871.32	$174.26
45378 Diagnostic exam of large bowel using a flexible endoscope	38	38	$871.32	$174.30
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	17	17	$871.32	$180.92

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	205	203	$1179.78	$254.35
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	108	107	$708.00	$96.26
45380 Biopsy of large bowel using an endoscope	85	85	$1065.00	$93.18
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	84	84	$280.00	$106.27
99213 Established patient office or other outpatient visit, typically 15 minutes	82	79	$187.00	$72.74
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	74	70	$905.00	$106.31
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	58	58	$415.00	$162.00
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	50	48	$277.80	$107.30
45378 Diagnostic exam of large bowel using a flexible endoscope	39	37	$871.32	$181.85
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	23	23	$871.32	$186.83
43249 Balloon dilation of esophagus using an endoscope	17	11	$950.00	$141.96
91065 Measurement of hydrogen in breath to test for stomach and bowel symptoms	15	13	$264.13	$65.18
43262 Incision of pancreatic outlet using a flexible endoscope	11	11	$1516.86	$153.08

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	267	262	$1179.78	$258.28
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	172	166	$708.00	$102.62
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	158	158	$280.00	$106.01
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	107	99	$905.00	$107.06
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	104	99	$275.00	$105.94
99213 Established patient office or other outpatient visit, typically 15 minutes	82	75	$187.00	$73.45
45380 Biopsy of large bowel using an endoscope	76	76	$1065.00	$110.87
45378 Diagnostic exam of large bowel using a flexible endoscope	48	48	$871.32	$184.19
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	30	30	$871.32	$189.06
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	30	30	$871.32	$188.78
91065 Measurement of hydrogen in breath to test for stomach and bowel symptoms	26	25	$325.23	$70.69
43249 Balloon dilation of esophagus using an endoscope	20	18	$1990.90	$133.51
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	14	14	$415.00	$162.66

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	186	185	$1179.78	$252.08
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	130	130	$280.00	$104.36
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	116	114	$708.00	$99.67
99213 Established patient office or other outpatient visit, typically 15 minutes	89	77	$187.00	$70.78
45380 Biopsy of large bowel using an endoscope	77	76	$1065.00	$118.23
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	71	68	$905.00	$99.59
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	69	63	$275.00	$104.10
45378 Diagnostic exam of large bowel using a flexible endoscope	51	51	$871.32	$173.45
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	31	31	$871.32	$180.05
91065 Measurement of hydrogen in breath to test for stomach and bowel symptoms	23	23	$294.00	$62.94
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	19	19	$871.32	$186.33
43248 Insertion of guide wire with dilation of esophagus using a flexible endoscope	16	14	$930.00	$152.51
43262 Incision of pancreatic outlet using a flexible endoscope	15	14	$1516.86	$143.93
43259 Ultrasound examination of esophagus, stomach and/or upper small bowel using an endoscope	14	14	$943.40	$163.66
91200 Measurement of liver stiffness	12	12	$75.00	$39.34

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
45385 Removal of polyps or growths of large bowel using an endoscope with mechanical snare	211	211	$1178.32	$254.37
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	180	180	$280.00	$102.68
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	157	134	$275.00	$104.56
43235 Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope	133	131	$708.00	$98.11
43239 Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope	106	98	$905.00	$98.18
45380 Biopsy of large bowel using an endoscope	104	104	$1065.00	$115.00
45378 Diagnostic exam of large bowel using a flexible endoscope	78	75	$871.32	$176.38
43259 Ultrasound examination of esophagus, stomach and/or upper small bowel using an endoscope	40	40	$943.40	$213.58
G0121 Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk	37	37	$871.32	$176.40
99213 Established patient office or other outpatient visit, typically 15 minutes	33	26	$187.00	$70.93
91065 Measurement of hydrogen in breath to test for stomach and bowel symptoms	30	29	$285.60	$61.45
G0105 Colorectal cancer screening; colonoscopy on individual at high risk	29	29	$871.32	$184.62
43248 Insertion of guide wire with dilation of esophagus using a flexible endoscope	23	22	$930.00	$148.91
43229 Destruction of growths of esophagus using an endoscope	17	14	$1650.00	$198.72
43262 Incision of pancreatic outlet using a flexible endoscope	12	11	$1516.86	$143.51
43246 Insertion of stomach tube using a flexible endoscope	11	11	$871.32	$200.66
45384 Removal of polyps or growths of large bowel using a flexible endoscope with electrical cautery	11	11	$1101.34	$161.45
91200 Measurement of liver stiffness	11	11	$75.00	$37.38

Medical Specialties & State Licenses

CMS Verified: 2022-07-12

Internal Medicine - Gastroenterology Primary Specialty

NUCC Taxonomy Code: 207RG0100X

State License OR MD10503

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

USA242450 (CA)

Medicaid State Provider ID

255661 (OR)

Commercial Insurance / Payer ID Regence Blue Cross

00SS91002 (OR)

Hospital & Practice Group Affiliations

Centennial Medical Group Inc

2510 Nw Edenbower Blvd, Roseburg, OR 974718899

Phone: 5415414646

Practice Associates & Co-Workers

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

19 Associated Practitioners

Rainie Rogers , PA-C

Physician Assistant

NPI 1154312627

Physician Assistant (Certified)

Sanam Nejad , PA

Physician Assistant

NPI 1225454655

Physician Assistant

Dr. Derrek Woodbury , DO

Orthopaedic Surgery

NPI 1235493099

Doctor of Osteopathic Medicine (D.O.)

Dr. Kathleen Moore , MD

Orthopaedic Surgery - Orthopaedic Surgery of the Spine

NPI 1285607721

Doctor of Medicine (M.D.)

Lindsey Reese , PA

Physician Assistant - Surgical

NPI 1437458163

Physician Assistant

Darlene Nastansky , PA-C

Physician Assistant

NPI 1447352232

Physician Assistant (Certified)

Career & Practice History Timeline

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

7 Historical Events

📍

Updated Practice Location July 12, 2022

Registered at 1342 NE MEDICAL CENTER DR STE 100, BEND, OR 977015918 (Tel: 5413882333)

✅

NPI Profile Active October 12, 2007

NPI status registered as active in NPPES database

📍

Updated Practice Location October 12, 2007

Registered at 2860 CREEKSIDE CIRCLE, MEDFORD, OR 97504 (Tel: 5417798367)

📍

Updated Business Mailing Address October 12, 2007

Registered at 2627 EASTOVER TERRACE, MEDFORD, OR 97504 (Tel: 5417725975)

👤

Provider Name / Credentials Updated October 12, 2007

Recorded as JOHN WALKER, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) October 12, 2007

Internal Medicine (License #MD10503 in OR)

🟢

Initial NPI Registration & Enumeration January 25, 2006

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: 1346210994

Entity Type:

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

Enumeration Date: January 25, 2006

Last Update: July 12, 2022

Sole Proprietor: No

Update or Correct Profile

Mailing Address

2627 Eastover Terrace

Medford, OR 97504

Phone: 5417725975

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.