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Dr. Mary M. O' Neil, MD


  • (716) 675-2500

Dr. O' Neil's Overview

Dr. Mary M. O' Neil graduated from the Saint Louis University School of Medicine in 1990. She works in Orchard Park, NY and specializes in Rheumatology. Dr. O' Neil is affiliated with Mercy Hospital Of Buffalo and Sisters Of Charity Hospital Saint Joseph Campus.

Dr. O' Neil's Experience

Years in Practice: 25

Procedures Performed by Dr. O' Neil

Dr. O' Neil's Specialties


Dr. O' Neil's Education & Training

Medical School: Saint Louis University School of Medicine; Graduated 1990

Dr. O' Neil's Rating

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Overall Rating


  • Explains conditions & treatments
  • Takes time to answer my questions
  • Provides follow-up as needed
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Dr. O' Neil's Accepted Insurance

  • Aetna Choice POS II
  • Aetna Managed Choice POS Open Access
  • Aetna Signature Administrators PPO
  • BCBS Blue Card PPO
  • CIGNA Open Access Plus
  • Great West PPO
  • Independent Health Encompass HMO
  • Independent Health FlexFit HMO
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Dr. O' Neil's Office Information & Appointments

Office Locations

Buffalo Rheumatology & Medicine

3055 Southwestern Blvd Ste 100
Orchard Park, NY 14127
(716) 675-2500


Office Hours and Information

Fax: (716) 675-2590

Practice Website: Not Available

Accepting New Patients: No

Medicare Accepted: Yes

Medicaid Accepted: No

Monday 9:00 AM - 4:00 PM
Tuesday 9:00 AM - 4:00 PM
Wednesday 9:00 AM - 4:00 PM
Thursday 9:00 AM - 4:00 PM
Friday 9:00 AM - 4:00 PM
Saturday Closed
Sunday Closed

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Office Locations

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