Quick answers
- Which hospitals does Marc Janis work at?
- Medicare's official clinician data lists Marc Janis at 5 hospitals: Montefiore Medical Center, Montefiore Mount Vernon Hospital, St John's Riverside Hospital, St Joseph's Medical Center and Westchester Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marc Janis see patients?
- Medicare's clinician data lists 3 practice locations, including Mount Vernon, NY and Yonkers, NY. Call before your visit to confirm the address.
- What is Marc Janis's specialty?
- Medicare lists Urology as the primary specialty.
- Does Marc Janis accept Medicare assignment?
- Medicare's clinician data says Marc Janis may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Marc Janis?
- (914) 664-7311, as listed in official Medicare / NPI Registry data.
- What is Marc Janis's NPI number?
- 1669587879. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marc Janis works
Medicare's Facility Affiliation Data lists Marc Janis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Montefiore Medical CenterBronx, NY · Acute Care Hospital · CCN 330059
- Montefiore Mount Vernon HospitalMount Vernon, NY · Acute Care Hospital · CCN 330086
- St John's Riverside HospitalYonkers, NY · Acute Care Hospital · CCN 330208
- St Joseph's Medical CenterYonkers, NY · Acute Care Hospital · CCN 330006
- Westchester Medical CenterValhalla, NY · Acute Care Hospital · CCN 330234
Practice locations
Addresses where Marc Janis is enrolled with Medicare (CMS data updated 2026-10-02).
- 105 Stevens Ave, Suite 109Mount Vernon, NY 10550 (914) 664‑7311
- 12 N 7th AveMount Vernon, NY 10550 (914) 664‑8000
- 944 N Broadway, Suite G06Yonkers, NY 10701 (914) 378‑1000
Group practices
Medicare enrollment lists Marc Janis as a member of this group (CMS data updated 2026-10-02).
- Montefiore Mount Vernon Hospital15 clinicians in the group
Specialties
- Urologyprimary
Other urologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Albert Einstein College Of Medicine Of Yeshiva University |
| Graduation year | 1986 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1669587879 |
| 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