Marwan Massouh, MD
NPI 1508841669ActiveIndividual· Internal Medicine, Hematology & Oncology· Westlake, OH
Internal Medicine, Hematology & Oncology (MD) with Northern Ohio Medical Specialists,llc, practicing in Westlake, Ohio. Their prescriptions cost Medicare Part D more than their services did: $1,430,869 for 910 claims, against $78,430 paid for services in 2024. Seagen Inc. was the largest of 2 companies reporting payments in 2025, $217.34 in all, mostly education. Lists Barrett Hospital & Healthcare and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1508841669 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Dec 13, 2005 |
| Last updated in NPPES | Oct 28, 2026 |
| Certified by provider | Oct 28, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 35056179 | OH |
| Internal Medicine, Hematology & Oncology | 207RH0003X | 11398 | MT |
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 - Hematology/Oncology (MT); Practitioner - Hematology/Oncology (OH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 338 |
|---|---|
| Services billed | 1,095 across 12 procedure codes |
| Paid by Medicare | $78,430 |
Part D prescriptions in 2024
| Prescriptions (claims) | 910 · 1,491 30-day fills |
|---|---|
| Patients | 193 |
| Total drug cost | $1,430,869 |
| Generic share | 79% of claims |
Education and affiliations
| Graduation year | 1982 |
|---|---|
| Medicare specialty | Hematology/Oncology |
Medical group
- Northern Ohio Medical Specialists,llcYoungstown, OH · 251 clinicians
Hospital affiliations
- Barrett Hospital & HealthcareDillon, MT
- Deer Lodge Medical CenterDeer Lodge, MT
- Firelands Regional Medical CenterSandusky, OH
- Fisher-Titus HospitalNorwalk, OH
- St James HospitalButte, MT
Industry payments (Open Payments)
- 2025$217.34 · 3 payments from 2 companies
- 2024$62.28 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Seagen Inc. | $199.94 | 2 |
| Novocure Inc. | $17.40 | 1 |
What the 2025 payments were for
- Education$199.94 · 2 payments
- Food and Beverage$17.40 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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