Mary Margaret Oneil, MD
NPI 1598790818ActiveIndividual· Internal Medicine, Rheumatology· Cheektowaga, NY
Internal Medicine, Rheumatology (MD) in Cheektowaga, New York, trained at Saint Louis University School of Medicine (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $1,470,565 for 2,031 claims, against $122,049 paid for services in 2024. Pfizer Inc. was the largest of 4 companies reporting payments in 2025, $92.69 in all, mostly food and beverage.
Overview
| NPI | 1598790818 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 12, 2006 |
| Last updated in NPPES | Oct 11, 2022 |
| Certified by provider | Oct 11, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | 188049-1 | NY |
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 - Rheumatology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 242 |
|---|---|
| Services billed | 7,071 across 37 procedure codes |
| Paid by Medicare | $122,049 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,031 · 3,859 30-day fills |
|---|---|
| Patients | 457 |
| Total drug cost | $1,470,565 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Saint Louis University School of Medicine |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Rheumatology |
| Telehealth | Offers telehealth |
Medical groups
- Brain and Spine Medical Services PLLCWilliamsville, NY · 56 clinicians
- Rheumatology Wellness Care of Wny PLLCCheektowaga, NY · 4 clinicians
Hospital affiliations
- Brooks-Tlc Hospital System, IncDunkirk, NY
- Kaleida HealthBuffalo, NY
- Mercy Hospital of BuffaloBuffalo, NY
- Sisters of Charity HospitalBuffalo, NY
- Upmc Chautauqua at WcaJamestown, NY
Industry payments (Open Payments)
- 2025$92.69 · 5 payments from 4 companies
- 2024$44.11 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $35.17 | 2 |
| Abbvie Inc. | $22.62 | 1 |
| Janssen Biotech, Inc. | $17.62 | 1 |
| Novartis Pharmaceuticals Corporation | $17.28 | 1 |
What the 2025 payments were for
- Food and Beverage$92.69 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Rheumatology providers in Cheektowaga
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