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

Dr. Ernst John Schaefer, MD

Individual provider Endocrinology, Diabetes & Metabolism Physician · NPI 1083803159

Dr. Ernst John Schaefer, MD is an Endocrinology, Diabetes & Metabolism Physician in Boston, Massachusetts. Practices as a sole proprietor. Licensed in Massachusetts.

Licensed in
MA
In the registry since
2007
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

252 Tremont St
Boston, MA 02116-5603
Phone: (781) 258-1454
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Endocrinology, Diabetes & Metabolism Physician (primary) Taxonomy 207RE0101X · Licence 50085 (MA)

Record details

NPI number1083803159
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 15, 2007
Last updated in NPPESOctober 15, 2007

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