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

Gregory A. Johnson, MD

Individual provider Internal Medicine Physician · NPI 1942213509

Gregory A. Johnson, MD is an Internal Medicine in Somerville, Massachusetts. Graduated from Warren Alpert Medical School of Brown University in 1993, 33 years ago. Practices with Atrius Health Inc, a 1,205-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
33
Trained at
Warren Alpert Medical School of Brown University
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

40 Holland St Harvard Vanguard Medical Associates
Somerville, MA 02144-2705
Phone: (617) 629-6350
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 151587 (MA)

Record details

NPI number1942213509
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 14, 2006
Last updated in NPPESFebruary 18, 2021
Certification dateFebruary 18, 2021
Mailing address40 Holland St, Harvard Vanguard Medical Associates, Somerville, MA 02144-2705

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolWARREN ALPERT MEDICAL SCHOOL OF BROWN UNIVERSITY
Graduated 1993 (33 years in practice)
Group practice Atrius Health Inc — 1205 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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