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

Mark S. Kassis, MD

Individual provider Internal Medicine Physician · NPI 1356309744

Mark S. Kassis, MD is an Internal Medicine Physician in Springfield, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2006.

Licensed in
MA
In the registry since
2006
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

3400 Main St
Springfield, MA 01107-1113
Phone: (413) 794-9560
Fax: (413) 794-5884
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 72426 (MA)
Pediatrics Physician Taxonomy 208000000X · Licence 73426 (MA)

Record details

NPI number1356309744
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 3, 2006
Last updated in NPPESFebruary 24, 2017
Mailing address280 Chestnut St, 2nd Fl, Springfield, MA 01199-1001

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