Quick answers
- Which hospitals does Nancy L. Sullivan work at?
- Medicare's official clinician data lists Nancy L. Sullivan at 3 hospitals: Bertrand Chaffee Hospital, Mercy Hospital of Buffalo and Sisters of Charity Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nancy L. Sullivan see patients?
- Medicare's clinician data lists 3 practice locations, including Williamsville, NY, Orchard Park, NY and Buffalo, NY. Call before your visit to confirm the address.
- What is Nancy L. Sullivan's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Nancy L. Sullivan accept Medicare assignment?
- Yes. Medicare's clinician data says Nancy L. Sullivan 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 Nancy L. Sullivan?
- (716) 630-1000, as listed in official Medicare / NPI Registry data.
- What is Nancy L. Sullivan's NPI number?
- 1992713598. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nancy L. Sullivan works
Medicare's Facility Affiliation Data lists Nancy L. Sullivan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Bertrand Chaffee HospitalSpringville, NY · Acute Care Hospital · CCN 330111
- Mercy Hospital of BuffaloBuffalo, NY · Acute Care Hospital · CCN 330279
- Sisters of Charity HospitalBuffalo, NY · Acute Care Hospital · CCN 330078
Practice locations
Addresses where Nancy L. Sullivan is enrolled with Medicare (CMS data updated 2026-10-02).
- 295 Essjay RdWilliamsville, NY 14221 (716) 630‑1000
- 3900 N Buffalo StOrchard Park, NY 14127 (716) 630‑1000
- 85 High StBuffalo, NY 14203 (716) 630‑1000
Group practices
Medicare enrollment lists Nancy L. Sullivan as a member of this group (CMS data updated 2026-10-02).
- Buffalo Medical Group, P.C.236 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Williamsville
Clinicians with the same Medicare primary specialty in Williamsville, NY — not a recommendation.
Clinician information
| Medical school | State University Of New York At Buffalo School Of Medicine |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1992713598 |
| 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