Mary Mansour Riwes, D.O.
NPI 1750548434ActiveIndividual· Internal Medicine, Medical Oncology· Ann Arbor, MI
Internal Medicine, Medical Oncology (D.O.) in Ann Arbor, Michigan, trained at New York College of Osteo Medicine of New York Institute of Technology (class of 2007). Their prescriptions cost Medicare Part D more than their services did: $460,601 for 174 claims, against $14,625 paid for services in 2024. National Marrow Donor Program reported $1,717 in payments in 2025, mostly travel and lodging.
Overview
| NPI | 1750548434 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | May 20, 2008 |
| Last updated in NPPES | Dec 2, 2020 |
| Certified by provider | Dec 2, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 5101020742 | 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 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 - Medical Oncology (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 33 |
|---|---|
| Services billed | 144 across 9 procedure codes |
| Paid by Medicare | $14,625 |
Part D prescriptions in 2024
| Prescriptions (claims) | 174 · 273 30-day fills |
|---|---|
| Patients | 23 |
| Total drug cost | $460,601 |
| Generic share | 59% of claims |
Education and affiliations
| Medical school | New York College of Osteo Medicine of New York Institute of Technology |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | Medical Oncology |
| Secondary specialties | Hematology, Internal Medicine |
Medical group
- Regents of the University of MichiganAnn Arbor, MI · 3,346 clinicians
Hospital affiliation
- University of Michigan Health SystemAnn Arbor, MI
Industry payments (Open Payments)
- 2025$1,717 · 5 payments from 1 company
- 2024$1,201 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| National Marrow Donor Program | $1,717 | 5 |
What the 2025 payments were for
- Travel and Lodging$1,392 · 3 payments
- Food and Beverage$324.91 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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