Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mary Margaret Oneil, MD

Individual provider Rheumatology Physician · NPI 1598790818

Mary Margaret Oneil, MD is a Rheumatology in Cheektowaga, New York. Graduated from Saint Louis University School of Medicine in 1990, 36 years ago. Practices with Rheumatology Wellness Care of Wny PLLC, a 4-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New York.

Years since qualifying
36
Trained at
Saint Louis University School of Medicine
Licensed in
NY
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2355 Union Rd Ste 100
Cheektowaga, NY 14227-2234
Phone: (716) 898-0755
Fax: (716) 898-0775
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X · Licence 188049-1 (NY)

Record details

NPI number1598790818
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 12, 2006
Last updated in NPPESOctober 11, 2022
Certification dateOctober 11, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRHEUMATOLOGY
Medical schoolSAINT LOUIS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1990 (36 years in practice)
Group practice Rheumatology Wellness Care Of Wny Pllc — 4 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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