Mary Oneil, MD
NPI 1598790818 · Rheumatology Physician · Cheektowaga, NY
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Oneil, MD is a Rheumatology Physician provider in Cheektowaga, NY (NPI 1598790818).
Provider details
- NPI number
- 1598790818
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 188049-1 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
543 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 250 | $127 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 89 | $90 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 61 | $122 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 56 | $14 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 32 | $175 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 351 | 119 |
| Prednisone | 307 | 108 |
| Methotrexate Sodiumbrand: Methotrexate | 207 | 65 |
| Meloxicam | 72 | 30 |
| Methylprednisolone | 60 | 32 |
| Folic Acid | 59 | 22 |
| Gabapentin | 55 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$44 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-12
- Last updated
- 2022-10-11
- Certified
- 2022-10-11
Frequently asked questions
- What is Mary Oneil's NPI number?
- Mary Oneil's National Provider Identifier (NPI) is 1598790818, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Oneil's specialty?
- Mary Oneil is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Oneil located?
- Mary Oneil's practice location on file with NPPES is 2355 Union Rd Ste 100, Cheektowaga, NY 14227-2234.
- What is Mary Oneil's phone number?
- The practice phone number listed in the NPPES registry for Mary Oneil is (716) 898-0755.
- Does Mary Oneil accept Medicare?
- Mary Oneil is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Oneil's NPI active?
- Yes — Mary Oneil's NPI (1598790818) is active in the NPPES registry as of the last update on 2022-10-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.