Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Michael J O'Brien, MD

Individual provider Anatomic Pathology Physician · NPI 1700858438

Michael J O'Brien, MD practises Pathology in Boston, Massachusetts. Qualified in 1971, 55 years ago. Practices with South Suburban Gastroenterology PC, a 50-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
55
Licensed in
MA
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

670 Albany St Fl 3 Rm 310
Boston, MA 02118-2646
Phone: (617) 414-5314
Fax: (617) 414-5315
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anatomic Pathology Physician (primary) Taxonomy 207ZP0101X · Licence 40684 (MA)

Record details

NPI number1700858438
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 6, 2006
Last updated in NPPESOctober 11, 2019

Medicare enrollment

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

Medicare specialtyPATHOLOGY
Medical schoolOTHER
Graduated 1971 (55 years in practice)
Group practice South Suburban Gastroenterology Pc — 50 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients974
Services billed 2,623 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at South Suburban Gastroenterology PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 50 clinicians in the practice; 10 are shown here.

Other providers in Boston