Gary Douglas Hammer, MD
NPI 1871676791ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Ann Arbor, MI
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in Ann Arbor, Michigan, trained at Tufts University School of Medicine (class of 1992). Part D covered 45 prescriptions written in 2024, 64% of them generic. Neurocrine Biosciences, Inc. reported $5,000 in payments in 2024, mostly consulting fees.
Overview
| NPI | 1871676791 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 23, 2006 |
| Last updated in NPPES | Oct 2, 2025 |
| Certified by provider | Oct 2, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 4301075475 | MI |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 4301075475 | 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 - Endocrinology (MI) |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 45 · 93 30-day fills |
|---|---|
| Total drug cost | $35,517 |
| Generic share | 64% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
Medical group
- Regents of the University of MichiganAnn Arbor, MI · 3,346 clinicians
Hospital affiliation
- University of Michigan Health SystemAnn Arbor, MI
Industry payments (Open Payments)
- 2024$5,000 · 1 payment from 1 company
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Neurocrine Biosciences, Inc. | $5,000 | 1 |
What the 2024 payments were for
- Consulting Fee$5,000 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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