Quick answers
- Which hospitals does Jonathan Y. Gefen work at?
- Medicare's official clinician data lists Jonathan Y. Gefen at 4 hospitals: Bryn Mawr 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 Jonathan Y. Gefen see patients?
- Medicare's clinician data lists 2 practice locations, including Wynewood, PA and Bryn Mawr, PA. Call before your visit to confirm the address.
- What is Jonathan Y. Gefen's specialty?
- Medicare lists General Surgery as the primary specialty.
- Does Jonathan Y. Gefen accept Medicare assignment?
- Yes. Medicare's clinician data says Jonathan Y. Gefen 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 Jonathan Y. Gefen's NPI number?
- 1497758452. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jonathan Y. Gefen works
Medicare's Facility Affiliation Data lists Jonathan Y. Gefen 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
- 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 Jonathan Y. Gefen is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 E Lancaster AveWynewood, PA 19096
- 830 Old Lancaster RdBryn Mawr, PA 19010
Group practices
Medicare enrollment lists Jonathan Y. Gefen as a member of this group (CMS data updated 2026-10-02).
- Main Line Healthcare1,184 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Wynewood
Clinicians with the same Medicare primary specialty in Wynewood, PA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Jefferson Medical College Of Thomas Jefferson University |
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1497758452 |
| 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