Quick answers
- Which hospitals does Alan M. Mermelstein work at?
- Medicare's official clinician data lists Alan M. Mermelstein at 1 hospital: Nazareth Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Alan M. Mermelstein see patients?
- Medicare's clinician data lists 5 practice locations, including Langhorne, PA and Philadelphia, PA. Call before your visit to confirm the address.
- What is Alan M. Mermelstein's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Alan M. Mermelstein accept Medicare assignment?
- Yes. Medicare's clinician data says Alan M. Mermelstein 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 Alan M. Mermelstein?
- (215) 750-2000, as listed in official Medicare / NPI Registry data.
- What is Alan M. Mermelstein's NPI number?
- 1073520458. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alan M. Mermelstein works
Medicare's Facility Affiliation Data lists Alan M. Mermelstein at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Nazareth HospitalPhiladelphia, PA · Acute Care Hospital · CCN 390204
Practice locations
Addresses where Alan M. Mermelstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 1201 Langhorne Newtown RdLanghorne, PA 19047
- 1201 Langhorne Newtown Rd, St Mary Medical CenterLanghorne, PA 19047 (215) 750‑2000
- 1403 Rhawn StPhiladelphia, PA 19111 (215) 335‑8100
- 1407 Rhawn StPhiladelphia, PA 19111
- 2601 Holme AvePhiladelphia, PA 19152
Group practices
Medicare enrollment lists Alan M. Mermelstein as a member of this group (CMS data updated 2026-10-02).
- Trinity Health Mid-Atlantic Medical Group334 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Langhorne
Clinicians with the same Medicare primary specialty in Langhorne, PA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Temple University School Of Medicine |
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1073520458 |
| 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