Quick answers
- Which hospitals does Katherine Ni work at?
- Medicare's official clinician data lists Katherine Ni at 1 hospital: Mount Sinai Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Katherine Ni see patients?
- Medicare's clinician data lists 2 practice locations, including Long Island City, NY and New York, NY. Call before your visit to confirm the address.
- What is Katherine Ni's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Katherine Ni accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine Ni 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 Katherine Ni?
- (212) 241-0034, as listed in official Medicare / NPI Registry data.
- What is Katherine Ni's NPI number?
- 1063916062. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Katherine Ni works
Medicare's Facility Affiliation Data lists Katherine Ni 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 Katherine Ni is enrolled with Medicare (CMS data updated 2026-10-02).
- 2520 30th AveLong Island City, NY 11102 (212) 241‑0034
- 5 E 98th St, Box 1104New York, NY 10029 (212) 241‑8035
Group practices
Medicare enrollment lists Katherine Ni 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
- Gastroenterologyprimary
Other gastroenterologists in Long Island City
Clinicians with the same Medicare primary specialty in Long Island City, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York University School Of Medicine |
| Graduation year | 2018 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1063916062 |
| 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