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

John J Callahan, MD

Individual provider Orthopaedic Hand Surgery Physician · NPI 1952338048

John J Callahan, MD is an Orthopedic Surgery in Amherst, New York. Graduated from State University of Ny Upstate Medical University in 1987, 39 years ago. Practices with Excelsior Orthopaedics LLP, a 146-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
39
Trained at
State University of Ny Upstate Medical University
Licensed in
NY
In the registry since
2006
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

3925 Sheridan Dr Ste 100
Amherst, NY 14226-0000
Phone: (716) 250-9999
Fax: (716) 250-4177
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Orthopaedic Hand Surgery Physician (primary) Taxonomy 207XS0106X · Licence 192324 (NY)

Record details

NPI number1952338048
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 26, 2006
Last updated in NPPESDecember 31, 2009
Mailing address3925 Sheridan Drive, Suite 100, Amherst, NY 14226-0000

Medicare enrollment

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

Medicare specialtyORTHOPEDIC SURGERY
Also practisesHAND SURGERY
Medical schoolSTATE UNIVERSITY OF NY UPSTATE MEDICAL UNIVERSITY
Graduated 1987 (39 years in practice)
Group practice Excelsior Orthopaedics Llp — 146 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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