Quick answers
- Which hospitals does Keying Yan work at?
- Medicare's official clinician data lists Keying Yan at 1 hospital: Milton S Hershey Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Keying Yan see patients?
- Medicare's clinician data lists 3 practice locations, including Lancaster, PA, Williamsport, PA and Hershey, PA. Call before your visit to confirm the address.
- What is Keying Yan's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Keying Yan accept Medicare assignment?
- Yes. Medicare's clinician data says Keying Yan 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 Keying Yan?
- (800) 243-1455, as listed in official Medicare / NPI Registry data.
- What is Keying Yan's NPI number?
- 1447924329. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Keying Yan works
Medicare's Facility Affiliation Data lists Keying Yan 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 Keying Yan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1430 Harrisburg PikeLancaster, PA 17601 (800) 243‑1455
- 1705 Warren Ave, Suite 303Williamsport, PA 17701 (570) 326‑8800
- 500 Universidy DrHershey, PA 17033 (717) 531‑5638
Group practices
Medicare enrollment lists Keying Yan as a member of these groups (CMS data updated 2026-10-02).
- The Milton S Hershey Medical Center Physicians Group1,623 clinicians in the group
- Susquehanna Physician Services612 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Lancaster
Clinicians with the same Medicare primary specialty in Lancaster, PA — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | State University Of New York - State College Optometry |
| Graduation year | 2022 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447924329 |
| 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