Quick answers
- Which hospitals does Alexander B. Gelfer work at?
- Medicare's official clinician data lists Alexander B. Gelfer at 1 hospital: Sisters of Charity Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Alexander B. Gelfer see patients?
- Medicare's clinician data lists 3 practice locations, including Williamsville, NY, Cheektowaga, NY and Amherst, NY. Call before your visit to confirm the address.
- What is Alexander B. Gelfer's specialty?
- Medicare lists Pulmonary Disease as the primary specialty.
- Does Alexander B. Gelfer accept Medicare assignment?
- Yes. Medicare's clinician data says Alexander B. Gelfer 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 Alexander B. Gelfer?
- (716) 891-2400, as listed in official Medicare / NPI Registry data.
- What is Alexander B. Gelfer's NPI number?
- 1689638462. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alexander B. Gelfer works
Medicare's Facility Affiliation Data lists Alexander B. Gelfer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Sisters of Charity HospitalBuffalo, NY · Acute Care Hospital · CCN 330078
Practice locations
Addresses where Alexander B. Gelfer is enrolled with Medicare (CMS data updated 2026-10-02).
- 199 Park Club LnWilliamsville, NY 14221
- 2605 Harlem RdCheektowaga, NY 14225 (716) 891‑2400
- 4949 Harlem RdAmherst, NY 14226 (716) 601‑3690
Group practices
Medicare enrollment lists Alexander B. Gelfer as a member of these groups (CMS data updated 2026-10-02).
- Sisters of Charity Hospital of Buffalo New York164 clinicians in the group
- Rpci Oncology, PC65 clinicians in the group
Specialties
- Pulmonary Diseaseprimary
Other pulmonologists in Williamsville
Clinicians with the same Medicare primary specialty in Williamsville, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1972 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1689638462 |
| 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