George J. Walker, M.D.
NPI 1528053121ActiveIndividual· Internal Medicine, Gastroenterology· Mesa, AZ
Internal Medicine, Gastroenterology (M.D.) with Arizona Digestive Health PC, practicing in Mesa, Arizona. Their prescriptions cost Medicare Part D more than their services did: $1,012,396 for 1,357 claims, against $122,606 paid for services in 2024. Abbvie Inc. was the largest of 20 companies reporting payments in 2025, $2,730 in all, mostly food and beverage. Lists Banner Baywood Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1528053121 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 20, 2005 |
| Last updated in NPPES | Feb 17, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 21847 | AZ |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 668 |
|---|---|
| Services billed | 1,228 across 40 procedure codes |
| Paid by Medicare | $122,606 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,357 · 2,894 30-day fills |
|---|---|
| Patients | 431 |
| Total drug cost | $1,012,396 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 1981 |
|---|---|
| Medicare specialty | Gastroenterology |
Medical group
- Arizona Digestive Health PCSun City, AZ · 136 clinicians
Hospital affiliations
- Banner Baywood Medical CenterMesa, AZ
- Banner Desert Medical CenterMesa, AZ
Industry payments (Open Payments)
- 2025$2,730 · 131 payments from 20 companies
- 2024$2,547 · 122 payments from 22 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $676.61 | 40 |
| Ipsen Biopharmaceuticals, Inc | $334.56 | 10 |
| Takeda Pharmaceuticals U.S.A., Inc. | $294.95 | 14 |
| Genzyme Corporation | $252.90 | 9 |
| Madrigal Pharmaceuticals | $230.68 | 5 |
What the 2025 payments were for
- Food and Beverage$2,730 · 131 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 53 gastroenterologists in Mesa · All gastroenterologists in Arizona