Michael C. Duffy, MD
NPI 1982693677ActiveIndividual· Internal Medicine, Gastroenterology· Troy, MI
Internal Medicine, Gastroenterology (MD) in Troy, Michigan, trained at Louisiana State University School of Medicine in New Orleans (class of 1974). Their prescriptions cost Medicare Part D more than their services did: $466,955 for 1,721 claims, against $167,047 paid for services in 2024. Janssen Biotech, Inc. was the largest of 2 companies reporting payments in 2025, $165.16 in all, mostly education.
Overview
| NPI | 1982693677 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 17, 2005 |
| Last updated in NPPES | Jul 13, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 052312 | MI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 871 |
|---|---|
| Services billed | 5,274 across 50 procedure codes |
| Paid by Medicare | $167,047 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,721 · 3,948 30-day fills |
|---|---|
| Patients | 560 |
| Total drug cost | $466,955 |
| Generic share | 92% of claims |
Education and affiliations
| Medical school | Louisiana State University School of Medicine in New Orleans |
|---|---|
| Graduation year | 1974 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical groups
- Beaumont Medical Group- Specialty ServicesBerkley, MI · 847 clinicians
- Gastrointestinal Specialists PCTroy, MI · 16 clinicians
Hospital affiliations
- Beaumont Hospital - Farmington HillsFarmington Hills, MI
- Beaumont Hospital Royal OakRoyal Oak, MI
- Beaumont Hospital, TroyTroy, MI
Industry payments (Open Payments)
- 2025$165.16 · 4 payments from 2 companies
- 2024$276.99 · 9 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $138.86 | 3 |
| Abbvie Inc. | $26.30 | 1 |
What the 2025 payments were for
- Education$99.99 · 1 payment
- Food and Beverage$65.17 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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