Quick answers
- Which hospitals does Jill B. Feffer work at?
- Medicare's official clinician data lists Jill B. Feffer at 1 hospital: Elmhurst Hospital Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jill B. Feffer see patients?
- Medicare's clinician data lists 1 practice location in Elmhurst, NY. Call before your visit to confirm the address.
- What is Jill B. Feffer's specialty?
- Medicare lists Endocrinology as the primary specialty, and also Internal Medicine.
- Does Jill B. Feffer accept Medicare assignment?
- Yes. Medicare's clinician data says Jill B. Feffer 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 Jill B. Feffer's NPI number?
- 1588906267. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jill B. Feffer works
Medicare's Facility Affiliation Data lists Jill B. Feffer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Elmhurst Hospital CenterElmhurst, NY · Acute Care Hospital · CCN 330128
Practice locations
Addresses where Jill B. Feffer is enrolled with Medicare (CMS data updated 2026-10-02).
- 7901 BroadwayElmhurst, NY 11373
Group practices
Medicare enrollment lists Jill B. Feffer as a member of this group (CMS data updated 2026-10-02).
- Icahn School of Medicine at Mount Sinai316 clinicians in the group
Specialties
- Endocrinologyprimary
- Internal Medicinealso
Other endocrinologists in Elmhurst
Clinicians with the same Medicare primary specialty in Elmhurst, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2013 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588906267 |
| 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