Oussama Moussan, M.D.
NPI 1467426171ActiveIndividual· Internal Medicine, Gastroenterology· Tacoma, WA
Internal Medicine, Gastroenterology (M.D.) with Washington Gastroenterology PLLC, practicing in Tacoma, Washington. In 2024 Medicare paid $90,403 for 463 patients, and Part D covered 646 of their prescriptions, 78% of them generic. Abbvie Inc. was the largest of 11 companies reporting payments in 2025, $940.83 in all, mostly food and beverage. Lists Multicare Good Samaritan Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1467426171 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 17, 2006 |
| Last updated in NPPES | Apr 7, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | MD00033213 | WA |
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 - Gastroenterology (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 463 |
|---|---|
| Services billed | 809 across 42 procedure codes |
| Paid by Medicare | $90,403 |
Part D prescriptions in 2024
| Prescriptions (claims) | 646 · 889 30-day fills |
|---|---|
| Patients | 422 |
| Total drug cost | $24,483 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 1982 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Washington Gastroenterology PLLCTacoma, WA · 143 clinicians
Hospital affiliations
- Multicare Good Samaritan HospitalPuyallup, WA
- Tacoma General Allenmore HospitalTacoma, WA
Industry payments (Open Payments)
- 2025$940.83 · 31 payments from 11 companies
- 2024$174.16 · 6 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $264.32 | 12 |
| Janssen Biotech, Inc. | $190.43 | 3 |
| Phathom Pharmaceuticals, Inc. | $138.81 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $136.91 | 5 |
| Lilly USA, LLC | $58.35 | 2 |
What the 2025 payments were for
- Food and Beverage$940.83 · 31 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 50 gastroenterologists in Tacoma · All gastroenterologists in Washington