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

John Ross Clark

Individual provider Hematology & Oncology Physician · NPI 1871550244

John Ross Clark is a Hematology & Oncology Physician in Boston, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2006.

Licensed in
MA
In the registry since
2006

Practice location Address checks out

55 Fruit Street Yaw 7B Mass General Hospital
Boston, MA 02114-2696
Phone: (617) 724-4000
Fax: (617) 643-1915
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 49154 (MA)

Record details

NPI number1871550244
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedApril 28, 2006
Last updated in NPPESJanuary 16, 2013
Mailing addressPo Box 9142, Mass General Physicians Organization Inc, Charlestown, MA 02129-9142

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