Quick answers
- Which hospitals does Colin J. McMahon work at?
- Medicare's official clinician data lists Colin J. McMahon at 3 hospitals: Kenmore Mercy Hospital, Mercy Hospital of Buffalo and Mount St. Mary's Hospital & Health Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Colin J. McMahon see patients?
- Medicare's clinician data lists 2 practice locations, including Kenmore, NY and Lewiston, NY. Call before your visit to confirm the address.
- What is Colin J. McMahon's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Pediatric Medicine.
- Does Colin J. McMahon accept Medicare assignment?
- Yes. Medicare's clinician data says Colin J. McMahon 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 Colin J. McMahon?
- (716) 447-6100, as listed in official Medicare / NPI Registry data.
- What is Colin J. McMahon's NPI number?
- 1427015650. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Colin J. McMahon works
Medicare's Facility Affiliation Data lists Colin J. McMahon at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Kenmore Mercy HospitalKenmore, NY · Acute Care Hospital · CCN 330102
- Mercy Hospital of BuffaloBuffalo, NY · Acute Care Hospital · CCN 330279
- Mount St. Mary's Hospital & Health CenterLewiston, NY · Acute Care Hospital · CCN 330188
Practice locations
Addresses where Colin J. McMahon is enrolled with Medicare (CMS data updated 2026-10-02).
- 2950 Elmwood AveKenmore, NY 14217 (716) 447‑6100
- 5300 Military RdLewiston, NY 14092 (716) 297‑4800
Group practices
Medicare enrollment lists Colin J. McMahon as a member of this group (CMS data updated 2026-10-02).
- Buffalo-Niagara Hospitalists LLC35 clinicians in the group
Specialties
- Internal Medicineprimary
- Pediatric Medicinealso
Other internal medicine doctors in Kenmore
Clinicians with the same Medicare primary specialty in Kenmore, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York At Buffalo School Of Medicine |
| Graduation year | 1990 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1427015650 |
| 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