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

Individual provider Internal Medicine Physician · NPI 1538162672

Dr. William J Kassler, MD is an Internal Medicine in Manchester, New Hampshire. Graduated from University of Massachusetts Medical School in 1984, 42 years ago. Practices with Amoskeag Health, a 28-clinician group and accepts Medicare assignment. Licensed in New Hampshire.

Years since qualifying
42
Trained at
University of Massachusetts Medical School
Licensed in
NH
In the registry since
2005
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

1415 Elm St
Manchester, NH 03101-1325
Phone: (603) 626-9500
Fax: (603) 626-0899
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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 10716 (NH)

Record details

NPI number1538162672
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 23, 2005
Last updated in NPPESDecember 4, 2013

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MASSACHUSETTS MEDICAL SCHOOL
Graduated 1984 (42 years in practice)
Group practice Amoskeag Health — 28 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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