Quick answers
- Where does Katherine A. Mager see patients?
- Medicare's clinician data lists 3 practice locations, including Williamsville, NY, Jamestown, NY and Buffalo, NY. Call before your visit to confirm the address.
- What is Katherine A. Mager's specialty?
- Medicare lists Gynecological Oncology as the primary specialty, and also Obstetrics/Gynecology.
- Does Katherine A. Mager accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine A. Mager 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 Katherine A. Mager?
- (716) 664-1909, as listed in official Medicare / NPI Registry data.
- What is Katherine A. Mager's NPI number?
- 1376825646. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Katherine A. Mager is enrolled with Medicare (CMS data updated 2026-10-02).
- 199 Park Club LnWilliamsville, NY 14221
- 21 Porter AveJamestown, NY 14701 (716) 664‑1909
- Elm and Carlton StBuffalo, NY 14263 (716) 845‑2300
Group practices
Medicare enrollment lists Katherine A. Mager as a member of these groups (CMS data updated 2026-10-02).
- Roswell Park Cancer Institute488 clinicians in the group
- Rpci Oncology, PC65 clinicians in the group
Specialties
- Gynecological Oncologyprimary
- Obstetrics/Gynecologyalso
Other gynecologic oncologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Jefferson Medical College Of Thomas Jefferson University |
| Graduation year | 2011 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1376825646 |
| 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
- 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