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

Mr. Steven J Kassels, MD

Individual provider Internal Medicine Physician · NPI 1154458735

Mr. Steven J Kassels, MD is an Internal Medicine Physician in Westfield, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2007.

Licensed in
MA
In the registry since
2007
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

125 N Elm St
Westfield, MA 01085-1643
Phone: (413) 568-6600
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 77240 (MA)
Addiction Medicine (Internal Medicine) Physician Taxonomy 207RA0401X · Licence 77240 (MA)

Record details

NPI number1154458735
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 28, 2007
Last updated in NPPESSeptember 11, 2025

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