John F. Walling Jr., DO
NPI 1073579512ActiveIndividual· Internal Medicine, Gastroenterology· East Lansing, MI
Internal Medicine, Gastroenterology (DO) in East Lansing, Michigan, trained at R Franklin University of Med & Sci/Chicago Medical School (class of 1986). Their prescriptions cost Medicare Part D more than their services did: $1,515,902 for 1,264 claims, against $92,666 paid for services in 2024. Abbvie Inc. was the largest of 11 companies reporting payments in 2025, $529.39 in all, mostly food and beverage.
Overview
| NPI | 1073579512 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Apr 24, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 5101009749 | MI |
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 (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 349 |
|---|---|
| Services billed | 2,868 across 41 procedure codes |
| Paid by Medicare | $92,666 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,264 · 1,910 30-day fills |
|---|---|
| Patients | 719 |
| Total drug cost | $1,515,902 |
| Generic share | 69% of claims |
Education and affiliations
| Medical school | R Franklin University of Med & Sci/Chicago Medical School |
|---|---|
| Graduation year | 1986 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical group
- Troy Gastroenterology PCRochester Hills, MI · 49 clinicians
Industry payments (Open Payments)
- 2025$529.39 · 26 payments from 11 companies
- 2024$699.91 · 30 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $167.02 | 10 |
| Janssen Biotech, Inc. | $77.53 | 3 |
| Lilly USA, LLC | $67.62 | 3 |
| Regeneron Healthcare Solutions, Inc. | $55.24 | 2 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $48.71 | 2 |
What the 2025 payments were for
- Food and Beverage$529.39 · 26 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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