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

Dr. Mary Joan O'Neill, MD

Individual provider Emergency Medicine Physician · NPI 1861431959

Dr. Mary Joan O'Neill, MD is an Emergency Medicine in Milford, Massachusetts. Graduated from University of Massachusetts Medical School in 1994, 32 years ago. Practices with Orion Emergency Services, Inc, a 17-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
32
Trained at
University of Massachusetts Medical School
Licensed in
MA
In the registry since
2006
Specialties on file
2
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

14 Prospect St
Milford, MA 01757-3003
Phone: (508) 422-2810
Fax: (508) 634-3276
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 300 Longwood Ave, Boston, MA 02115-5724 — (617) 355-6000

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 152946 (MA)
Pediatric Emergency Medicine (Pediatrics) Physician Taxonomy 2080P0204X · Licence 152946 (MA)

Record details

NPI number1861431959
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 5, 2006
Last updated in NPPESSeptember 8, 2025
Certification dateSeptember 8, 2025

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Also practisesPEDIATRIC MEDICINE
Medical schoolUNIVERSITY OF MASSACHUSETTS MEDICAL SCHOOL
Graduated 1994 (32 years in practice)
Group practice Orion Emergency Services, Inc. — 17 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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