Quick answers
- Which hospitals does William R. Greer work at?
- Medicare's official clinician data lists William R. Greer at 5 hospitals: Bryn Mawr Hospital, Chester County Hospital, Main Line Hospital Lankenau, Paoli Hospital and Riddle Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William R. Greer see patients?
- Medicare's clinician data lists 2 practice locations, including Cranberry Twp, PA and Paoli, PA. Call before your visit to confirm the address.
- What is William R. Greer's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does William R. Greer accept Medicare assignment?
- Yes. Medicare's clinician data says William R. Greer 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.
- Does William R. Greer offer telehealth?
- Medicare's clinician data says William R. Greer offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William R. Greer?
- (610) 651-0370, as listed in official Medicare / NPI Registry data.
- What is William R. Greer's NPI number?
- 1598722472. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William R. Greer works
Medicare's Facility Affiliation Data lists William R. Greer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Bryn Mawr HospitalBryn Mawr, PA · Acute Care Hospital · CCN 390139
- Chester County HospitalWest Chester, PA · Acute Care Hospital · CCN 390179
- Main Line Hospital LankenauWynnewood, PA · Acute Care Hospital · CCN 390195
- Paoli HospitalPaoli, PA · Acute Care Hospital · CCN 390153
- Riddle Memorial HospitalMedia, PA · Acute Care Hospital · CCN 390222
Practice locations
Addresses where William R. Greer is enrolled with Medicare (CMS data updated 2026-10-02).
- 2000 Westinghouse Dr, Suite 200Cranberry Twp, PA 16066
- 21 Industrial Blvd, Suite 200Paoli, PA 19301 (610) 651‑0370
Group practices
Medicare enrollment lists William R. Greer as a member of this group (CMS data updated 2026-10-02).
- Phoenix Rehabilitation and Health Services Inc2,800 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Cranberry Twp
Clinicians with the same Medicare primary specialty in Cranberry Twp, PA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Perelman School Of Med At The University Of Pennsylvania |
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1598722472 |
| 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