Quick answers
- Which hospitals does Ann Ouyang work at?
- Medicare's official clinician data lists Ann Ouyang at 1 hospital: Milton S Hershey Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ann Ouyang see patients?
- Medicare's clinician data lists 1 practice location in Hershey, PA. Call before your visit to confirm the address.
- What is Ann Ouyang's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Ann Ouyang accept Medicare assignment?
- Yes. Medicare's clinician data says Ann Ouyang 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 Ann Ouyang?
- (717) 531-6261, as listed in official Medicare / NPI Registry data.
- What is Ann Ouyang's NPI number?
- 1104884238. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ann Ouyang works
Medicare's Facility Affiliation Data lists Ann Ouyang at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Milton S Hershey Medical CenterHershey, PA · Acute Care Hospital · CCN 390256
Practice locations
Addresses where Ann Ouyang is enrolled with Medicare (CMS data updated 2026-10-02).
- 500 Universidy Dr, A410Hershey, PA 17033 (717) 531‑6261
Group practices
Medicare enrollment lists Ann Ouyang as a member of this group (CMS data updated 2026-10-02).
- The Milton S Hershey Medical Center Physicians Group1,623 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Hershey
Clinicians with the same Medicare primary specialty in Hershey, PA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1974 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104884238 |
| 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