Ghassan A. Alzayer, MD
NPI 1396144804ActiveIndividual· Internal Medicine, Gastroenterology· Washington, DC
Internal Medicine, Gastroenterology (MD) with Medstar Medical Group II LLC, practicing in Washington, District of Columbia. 346 Medicare patients in 2024, $68,353 paid; nearly all of their 409 Part D prescriptions were generic (91%). Janssen Biotech, Inc. was the largest of 3 companies reporting payments in 2025, $124.35 in all, mostly food and beverage. Lists Medstar Washington Hospital Center as a hospital affiliation.
Overview
| NPI | 1396144804 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 20, 2014 |
| Last updated in NPPES | Nov 9, 2022 |
| Certified by provider | Nov 9, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | MD046302 | DC |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 (DC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 346 |
|---|---|
| Services billed | 563 across 39 procedure codes |
| Paid by Medicare | $68,353 |
Part D prescriptions in 2024
| Prescriptions (claims) | 409 · 741 30-day fills |
|---|---|
| Patients | 188 |
| Total drug cost | $22,856 |
| Generic share | 91% of claims |
Education and affiliations
| Graduation year | 2010 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Medstar Medical Group II LLCWashington, DC · 3,767 clinicians
Hospital affiliation
- Medstar Washington Hospital CenterWashington, DC
Industry payments (Open Payments)
- 2025$124.35 · 5 payments from 3 companies
- 2024$171.18 · 4 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $74.72 | 3 |
| Pfizer Inc. | $31.00 | 1 |
| Takeda Pharmaceuticals U.S.A., Inc. | $18.63 | 1 |
What the 2025 payments were for
- Food and Beverage$93.35 · 4 payments
- Education$31.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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