Gregory Heront Marcarian, M.D.
NPI 1346228566ActiveIndividual· Internal Medicine· Dearborn Heights, MI
Internal Medicine (M.D.) in Dearborn Heights, Michigan, trained at Wayne State University School of Medicine (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $430,623 for 4,215 claims, against $50,091 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 8 companies reporting payments in 2025, $383.08 in all, mostly food and beverage.
Overview
| NPI | 1346228566 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 6, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 073156 | 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 - Internal Medicine (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 124 |
|---|---|
| Services billed | 961 across 39 procedure codes |
| Paid by Medicare | $50,091 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,215 · 10,123 30-day fills |
|---|---|
| Patients | 311 |
| Total drug cost | $430,623 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Wayne State University School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Tenny Internal Medicine PLLCDearborn, MI · 6 clinicians
Hospital affiliations
- Beaumont Hospital - DearbornDearborn, MI
- Beaumont Hospital - Farmington HillsFarmington Hills, MI
- Beaumont Hospital - TaylorTaylor, MI
Other facilities
- Beaumont Home HealthHome health agency · Troy, MI
Industry payments (Open Payments)
- 2025$383.08 · 22 payments from 8 companies
- 2024$1,033 · 58 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $196.70 | 12 |
| Glaxosmithkline, LLC. | $48.10 | 3 |
| Novo Nordisk Inc | $36.65 | 2 |
| Sanofi-Aventis U.S. LLC | $26.65 | 1 |
| Pfizer Inc. | $22.89 | 1 |
What the 2025 payments were for
- Food and Beverage$383.08 · 22 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 44 internal medicine physicians in Dearborn Heights · All internal medicine physicians in Michigan