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21 years of experience
Accepting new patients
License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (9)

The overall average patient rating of Dr. Mary Oneil is Excellent. Dr. Oneil has been reviewed by 51 patients who have provided 9 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.7
Promptness 4.6
Courteous Staff 4.9
Accurate Diagnosis 4.9
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 4.8

Specialties & Research

Dr. Mary Oneil, MD is board certified in Rheumatology.

  • She has special expertise in 6 areas:
  • Arthritis
  • Hip Osteoarthritis
  • Knee Osteoarthritis
  • Osteoarthritis (Hand and Wrist)
  • Rheumatic Diseases
  • Rheumatoid Arthritis

Education & Awards

Dr. Oneil graduated from Saint Louis University. She has 2 awards.

Patients' Choice Award (2015)
On-Time Doctor Award (2014 - 2015)


Dr. Oneil has 7 hospital affiliations:

  • Catholic Health System - Mercy Hospital of Buffalo 
  • Millard Fillmore Hospital 

> > > Dr. Mary Oneil, MD

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Additional Information
Dr. Mary Margaret Oneil MD is a female Rheumatologist, has 21 years of experience and practices in Rheumatology.
Where does Dr. Mary M. Oneil practice?
Dr. Mary Oneil has 1 office location.
Dr. Mary Oneil practices Rheumatology near Cheektowaga, NY.