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

Ralph J Blair, MD

Individual provider Internal Medicine Physician · NPI 1275568230

Ralph J Blair, MD is an Internal Medicine Physician in Cambridge, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2006.

Licensed in
MA
In the registry since
2006
Specialties on file
3
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

330 Mount Auburn St
Cambridge, MA 02138-5502
Phone: (617) 492-3500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 51227 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 51227 (MA)
Infectious Disease Physician Taxonomy 207RI0200X · Licence 51227 (MA)

Record details

NPI number1275568230
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 11, 2006
Last updated in NPPESSeptember 11, 2025
Mailing address147 Milk St, Provider Enrollment - 9th Floor, Boston, MA 02109-4806

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