Quick answers
- Which hospitals does William Kassler work at?
- Medicare's official clinician data lists William Kassler at 1 hospital: Elliot Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Kassler see patients?
- Medicare's clinician data lists 3 practice locations, including Manchester, NH. Call before your visit to confirm the address.
- What is William Kassler's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does William Kassler accept Medicare assignment?
- Yes. Medicare's clinician data says William Kassler accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William Kassler?
- (603) 626-9500, as listed in official Medicare / NPI Registry data.
- What is William Kassler's NPI number?
- 1538162672. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William Kassler works
Medicare's Facility Affiliation Data lists William Kassler at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Elliot HospitalManchester, NH · Acute Care Hospital · CCN 300012
Practice locations
Addresses where William Kassler is enrolled with Medicare (CMS data updated 2026-10-02).
- 1245 Elm StManchester, NH 03101 (603) 626‑9500
- 145 Hollis StManchester, NH 03101 (603) 626‑9500
- 1555 Elm StManchester, NH 03101 (603) 626‑9500
Group practices
Medicare enrollment lists William Kassler as a member of this group (CMS data updated 2026-10-02).
- Amoskeag Health32 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Manchester
Clinicians with the same Medicare primary specialty in Manchester, NH — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Massachusetts Medical School |
| Graduation year | 1984 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538162672 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians