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

Dr. Matthew J O Brien, MD

Individual provider Internal Medicine Physician · NPI 1972551430

Dr. Matthew J O Brien, MD is an Internal Medicine Physician in Buffalo, New York. Licensed in New York. Registered with an NPI since 2006.

Licensed in
NY
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

85 High St
Buffalo, NY 14203-1149
Phone: (716) 857-8616
Fax: (716) 250-5945
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 141215-1 (NY)

Record details

NPI number1972551430
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 5, 2006
Last updated in NPPESApril 14, 2008

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