Quick answers
- Which hospitals does Mark J. Leber work at?
- Medicare's official clinician data lists Mark J. Leber at 1 hospital: Brooklyn Hospital Center - Downtown Campus. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark J. Leber see patients?
- Medicare's clinician data lists 1 practice location in Brooklyn, NY. Call before your visit to confirm the address.
- What is Mark J. Leber's specialty?
- Medicare lists Emergency Medicine as the primary specialty, and also Internal Medicine.
- Does Mark J. Leber accept Medicare assignment?
- Yes. Medicare's clinician data says Mark J. Leber 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 Mark J. Leber?
- (718) 250-8000, as listed in official Medicare / NPI Registry data.
- What is Mark J. Leber's NPI number?
- 1629090634. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark J. Leber works
Medicare's Facility Affiliation Data lists Mark J. Leber at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Brooklyn Hospital Center - Downtown CampusBrooklyn, NY · Acute Care Hospital · CCN 330056
Practice locations
Addresses where Mark J. Leber is enrolled with Medicare (CMS data updated 2026-10-02).
- 121 Dekalb AveBrooklyn, NY 11201 (718) 250‑8000
Group practices
Medicare enrollment lists Mark J. Leber as a member of this group (CMS data updated 2026-10-02).
- Emergency Care Services of New York PC43 clinicians in the group
Specialties
- Emergency Medicineprimary
- Internal Medicinealso
Other emergency medicine doctors in Brooklyn
Clinicians with the same Medicare primary specialty in Brooklyn, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York Medical College |
| Graduation year | 1976 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1629090634 |
| 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