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

Dr. James W O'Brien, MD

Individual provider Gastroenterology Physician · NPI 1841275252

Dr. James W O'Brien, MD is a Gastroenterology in Manchester, Connecticut. Graduated from Duke University School of Medicine in 1991, 35 years ago. Practices with Hilo Benioff Medical Center, a 131-clinician group and accepts Medicare assignment. Licensed in Connecticut and Hawaii.

Years since qualifying
35
Trained at
Duke University School of Medicine
Licensed in
CT, HI
In the registry since
2005
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

353 Main St
Manchester, CT 06040-4145
Phone: (860) 649-3477
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 035189 (CT)
Gastroenterology Physician Taxonomy 207RG0100X · Licence MD-19477 (HI)

Record details

NPI number1841275252
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 8, 2005
Last updated in NPPESMay 1, 2025
Certification dateMay 1, 2025

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolDUKE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1991 (35 years in practice)
Group practice Hilo Benioff Medical Center — 131 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Manchester