Quick answers
- Which hospitals does William K. Oh work at?
- Medicare's official clinician data lists William K. Oh at 4 hospitals: Bridgeport Hospital, Greenwich Hospital Association -, Mount Sinai Hospital and Yale-New Haven Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William K. Oh see patients?
- Medicare's clinician data lists 2 practice locations, including Hudson, NY and New Haven, CT. Call before your visit to confirm the address.
- What is William K. Oh's specialty?
- Medicare lists Medical Oncology as the primary specialty.
- Does William K. Oh accept Medicare assignment?
- Medicare's clinician data says William K. Oh may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does William K. Oh offer telehealth?
- Medicare's clinician data says William K. Oh offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William K. Oh?
- (800) 479-7695, as listed in official Medicare / NPI Registry data.
- What is William K. Oh's NPI number?
- 1225095581. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William K. Oh works
Medicare's Facility Affiliation Data lists William K. Oh at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Bridgeport HospitalBridgeport, CT · Acute Care Hospital · CCN 070010
- Greenwich Hospital Association -Greenwich, CT · Acute Care Hospital · CCN 070018
- Mount Sinai HospitalNew York, NY · Acute Care Hospital · CCN 330024
- Yale-New Haven HospitalNew Haven, CT · Acute Care Hospital · CCN 070022
Practice locations
Addresses where William K. Oh is enrolled with Medicare (CMS data updated 2026-10-02).
- 125 Harry Howard AveHudson, NY 12534 (800) 479‑7695
- 35 Park StNew Haven, CT 06519 (203) 785‑4191
Group practices
Medicare enrollment lists William K. Oh as a member of these groups (CMS data updated 2026-10-02).
- Yale University2,645 clinicians in the group
- Select PT, Ot and SLP Rehabilitation Ny, PLLC301 clinicians in the group
Specialties
- Medical Oncologyprimary
Other oncologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York University School Of Medicine |
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1225095581 |
| 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