DR. GEORGE J WALKER (M.D.) – Gastroenterology Physician, NPI 1528053121
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
431 GASTROENTEROLOGY in AZ
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Provider Addresses for DR. GEORGE J WALKER (M.D.)
3020, East Camelback Road, Biltmore Villas, Camelback East, Phoenix, Maricopa County, Arizona, 85016, United States
SUITE 301
PHOENIX, AZ 850145095
Phone: (602) 264-9100
Fax: (602) 264-9101
Type: Mailing
Arizona Digestive Health, 6020, East Arbor Avenue, Buckhorn, Mesa, Maricopa County, Arizona, 85206, United States
#101
MESA, AZ 852066102
Phone: (480) 985-1700
Fax: (480) 396-3659
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 261 Open Payments records for all available years, with a total value of $5,168.
Total Amount is formed as General ($5,168) + Research ($0) + Ownership ($0) = $5,168.
Last reported payment date: 2024-12-17 • Largest payer in this snapshot: ABBVIE INC. ($1,669).
Total Amount
$5,168
General + Research + Ownership
Payments
261
Total payment records
General Amount
$5,168
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
2
Ownership records
Last Payment Date
2024-12-17
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $1,669 |
| PFIZER INC. | $471 |
| Ferring Pharmaceuticals Inc. | $458 |
| Janssen Biotech, Inc. | $409 |
| Merck Sharp & Dohme LLC | $192 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2008-04-04
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20080404000393 | I | Gastroenterology | AZ | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 243 | 217 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 176 | 172 | $0 |
| 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 | 157 | 15 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 146 | 146 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 129 | 127 | $0 |
Insurance plans in this area (ZIP 85014)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | AZ | 43235 | Diagnostic examination of esophagus, stomach, and/or upper small bowel using an endoscope | 21 | 21 |
| GASTROENTEROLOGY | AZ | 45378 | Diagnostic examination of large bowel using an endoscope | 22 | 22 |
| GASTROENTEROLOGY | AZ | 45385 | Removal of polyps or growths of large bowel using an endoscope | 129 | 129 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine, Gastroenterology | TN | |
| - | AZ | |
| General Surgery, Vascular Surgery | AZ | |
| Orthopedic Surgery, Hand Surgery | AZ | |
| Physician Assistant | WA | |
| Physician Assistant | AZ | |
| Internal Medicine | AZ | |
| Internal Medicine | AZ | |
| - | AZ | |
| Nurse Practitioner | WA |
Reviews
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