Quick answers
- Which hospitals does Gregory S. Willis work at?
- Medicare's official clinician data lists Gregory S. Willis at 3 hospitals: UPMC Hanover, UPMC Memorial and UPMC Pinnacle Hospitals. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory S. Willis see patients?
- Medicare's clinician data lists 13 practice locations, including Lititz, PA, York, PA and Hanover, PA. Call before your visit to confirm the address.
- What is Gregory S. Willis's specialty?
- Medicare lists Gynecological Oncology as the primary specialty, and also Obstetrics/Gynecology.
- Does Gregory S. Willis accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory S. Willis 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 Gregory S. Willis?
- (717) 988-0611, as listed in official Medicare / NPI Registry data.
- What is Gregory S. Willis's NPI number?
- 1184605677. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory S. Willis works
Medicare's Facility Affiliation Data lists Gregory S. Willis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- UPMC HanoverHanover, PA · Acute Care Hospital · CCN 390233
- UPMC MemorialYork, PA · Acute Care Hospital · CCN 390101
- UPMC Pinnacle HospitalsHarrisburg, PA · Acute Care Hospital · CCN 390067
Practice locations
Addresses where Gregory S. Willis is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 13; the Medicare profile lists all.
Group practices
Medicare enrollment lists Gregory S. Willis as a member of this group (CMS data updated 2026-10-02).
- Pinnacle Health Medical Services1,019 clinicians in the group
Specialties
- Gynecological Oncologyprimary
- Obstetrics/Gynecologyalso
Other gynecologic oncologists in Pennsylvania
Clinicians with the same Medicare primary specialty in Pennsylvania — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | University Of North Texas Hsc, College Of Osteopathic Med |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1184605677 |
| 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