George Grunberger, MD
NPI 1477558450ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Bloomfield Hills, MI
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) in Bloomfield Hills, Michigan, trained at New York University School of Medicine (class of 1977). Their prescriptions cost Medicare Part D more than their services did: $1,344,780 for 1,842 claims, against $102,167 paid for services in 2024. Lilly USA, LLC was the largest of 24 companies reporting payments in 2025, $138,825 in all, mostly speaking and faculty fees.
Overview
| NPI | 1477558450 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jun 16, 2005 |
| Last updated in NPPES | Oct 10, 2011 |
| Reactivated | Apr 3, 2006 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 4301049764 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 260 |
|---|---|
| Services billed | 2,589 across 22 procedure codes |
| Paid by Medicare | $102,167 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,842 · 4,675 30-day fills |
|---|---|
| Patients | 217 |
| Total drug cost | $1,344,780 |
| Generic share | 38% of claims |
Education and affiliations
| Medical school | New York University School of Medicine |
|---|---|
| Graduation year | 1977 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Endocrinology |
Medical group
- Grunberger Diabetes Medical Center PCBloomfield Hills, MI · 3 clinicians
Hospital affiliation
- Northwestern Medicine Central Dupage HospitalWinfield, IL
Industry payments (Open Payments)
- 2025$138,825 · 240 payments from 24 companies
- 2024$92,755 · 197 payments from 25 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $86,415 | 96 |
| Abbott Laboratories | $21,250 | 34 |
| Mannkind Corporation | $9,769 | 17 |
| Sanofi-Aventis U.S. LLC | $9,660 | 7 |
| Vertex Pharmaceuticals Incorporated | $9,198 | 11 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$87,455 · 34 payments
- Consulting Fee$14,175 · 5 payments
- Travel and Lodging$11,919 · 58 payments
- Compensation for serving as faculty or as a speaker for a medical education program$10,369 · 11 payments
- Honoraria$9,125 · 2 payments
- Food and Beverage$5,783 · 130 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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