MR. STEVEN J KASSELS MD
NPI 1154458735
Internal Medicine in Westfield, MA

Active since February 28, 2007
125 N ELM ST, WESTFIELD, MA 01085(413) 568-6600 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Mr. Steven J Kassels Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MR. STEVEN J KASSELS MD (NPI 1154458735) is an individual internal medicine provider in Westfield, Massachusetts, licensed in Massachusetts (77240) and active in the NPI registry since February 2007.

NPPES Registry Identity

NPI1154458735
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMR. STEVEN J KASSELSCredential: MD
Location Address125 N ELM STWestfield, MA 01085-1643
Mailing Address125 North Elm Street, 3rd FloorWestfield, MA 01085 · (413) 568-6600 · Fax (413) 562-8360
Sole ProprietorNo
Enumeration DateFebruary 28, 2007
Last NPPES UpdateSeptember 11, 2025
NPI 1154458735 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License Licensed in MA · 77240
Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Also ListedInternal Medicine · Addiction MedicineTaxonomy 207RA0401X · License 77240 (MA)
125 N ELM ST, Westfield, MA 01085

Other Providers at the Same Location NPPES 17

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Contractor
125 N ELM ST, 3RD FLOOR
WESTFIELD, MA 01085
Counselor (Addiction (Substance Use Disorder))
125 N ELM ST
WESTFIELD, MA 01085
Licensed Practical Nurse
125 N ELM ST
WESTFIELD, MA 01085
Nurse Practitioner
125 N ELM ST
WESTFIELD, MA 01085
Counselor (Addiction (Substance Use Disorder))
125 N ELM ST
WESTFIELD, MA 01085
Registered Nurse
125 N ELM ST
WESTFIELD, MA 01085
Counselor (Addiction (Substance Use Disorder))
125 N ELM ST
WESTFIELD, MA 01085
Counselor (Addiction (Substance Use Disorder))
125 N ELM ST
WESTFIELD, MA 01085

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Steven Kassels's NPI number?

The NPI number for Steven Kassels is 1154458735. It was assigned to this individual provider in the NPPES registry on February 28, 2007.

Where is Steven Kassels located?

Steven Kassels practices at 125 N Elm St, Westfield, MA 01085. The listed phone number is (413) 568-6600.

What is Steven Kassels's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Steven Kassels was last updated on September 11, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.