Quick answers
- Which hospitals does Rex R. Hermansen work at?
- Medicare's official clinician data lists Rex R. Hermansen at 1 hospital: Mount Sinai Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Rex R. Hermansen see patients?
- Medicare's clinician data lists 1 practice location in New York, NY. Call before your visit to confirm the address.
- What is Rex R. Hermansen's specialty?
- Medicare lists Hospitalist as the primary specialty.
- Does Rex R. Hermansen accept Medicare assignment?
- Yes. Medicare's clinician data says Rex R. Hermansen 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 Rex R. Hermansen?
- (212) 659-8551, as listed in official Medicare / NPI Registry data.
- What is Rex R. Hermansen's NPI number?
- 1639532039. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Rex R. Hermansen works
Medicare's Facility Affiliation Data lists Rex R. Hermansen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mount Sinai HospitalNew York, NY · Acute Care Hospital · CCN 330024
Practice locations
Addresses where Rex R. Hermansen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Gustave L Levy PlNew York, NY 10029 (212) 659‑8551
Group practices
Medicare enrollment lists Rex R. Hermansen as a member of this group (CMS data updated 2026-10-02).
- Icahn School of Medicine at Mount Sinai2,843 clinicians in the group
Specialties
- Hospitalistprimary
Other hospitalists in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At San Antonio |
| Graduation year | 2016 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639532039 |
| 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