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

Dr. Johnathan Mack, MD

Individual provider Hematology (Internal Medicine) Physician · NPI 1972982650

Dr. Johnathan Mack, MD is a Hematology (Internal Medicine) Physician in Boston, Massachusetts. Practices as a sole proprietor. Licensed in Massachusetts.

Licensed in
MA
In the registry since
2015
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

55 Fruit Street Massachusetts General Hospital Blood Bank GRJ-238
Boston, MA 02114
Phone: (617) 726-3785
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Blood Banking & Transfusion Medicine Physician (primary) Taxonomy 207ZB0001X · Licence 267360 (MA)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence 267360 (MA)

Record details

NPI number1972982650
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 27, 2015
Last updated in NPPESSeptember 8, 2016
Mailing address55 Fruit Street, Massachusetts General Hospital, Blood Bank, Grj-238, Boston, MA 02114-2621

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