Quick answers
- Which hospitals does John J. Callahan work at?
- Medicare's official clinician data lists John J. Callahan at 2 hospitals: Erie County Medical Center and Mercy Hospital of Buffalo. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John J. Callahan see patients?
- Medicare's clinician data lists 5 practice locations, including Niagara Falls, NY, Orchard Park, NY and Amherst, NY. Call before your visit to confirm the address.
- What is John J. Callahan's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty, and also Hand Surgery.
- Does John J. Callahan accept Medicare assignment?
- Yes. Medicare's clinician data says John J. Callahan 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 John J. Callahan?
- (716) 250-9999, as listed in official Medicare / NPI Registry data.
- What is John J. Callahan's NPI number?
- 1952338048. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John J. Callahan works
Medicare's Facility Affiliation Data lists John J. Callahan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Erie County Medical CenterBuffalo, NY · Acute Care Hospital · CCN 330219
- Mercy Hospital of BuffaloBuffalo, NY · Acute Care Hospital · CCN 330279
Practice locations
Addresses where John J. Callahan is enrolled with Medicare (CMS data updated 2026-10-02).
- 10195 Niagara Falls Blvd, Suite 100Niagara Falls, NY 14304 (716) 250‑9999
- 260 Red Tail RdOrchard Park, NY 14127 (716) 250‑9999
- 3925 Sheridan DrAmherst, NY 14226 (716) 250‑9999
- 3925 Sheridan Dr, Suite 100Amherst, NY 14226
- 8750 Transit RdEast Amherst, NY 14051
Group practices
Medicare enrollment lists John J. Callahan as a member of this group (CMS data updated 2026-10-02).
- Excelsior Orthopaedics LLP144 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
- Hand Surgeryalso
Other orthopedic surgeons in Niagara Falls
Clinicians with the same Medicare primary specialty in Niagara Falls, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of Ny Upstate Medical University |
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1952338048 |
| 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