Quick answers
- Which hospitals does Tonya W. An work at?
- Medicare's official clinician data lists Tonya W. An at 2 hospitals: Stanford Health Care and Stanford Health Care Tri-Valley. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Tonya W. An see patients?
- Medicare's clinician data lists 3 practice locations, including Palo Alto, CA and Pasadena, CA. Call before your visit to confirm the address.
- What is Tonya W. An's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Tonya W. An accept Medicare assignment?
- Medicare's clinician data says Tonya W. An may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Tonya W. An offer telehealth?
- Medicare's clinician data says Tonya W. An offers telehealth services. Ask the office which visits can be done by video or phone.
- What is Tonya W. An's NPI number?
- 1699292045. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Tonya W. An works
Medicare's Facility Affiliation Data lists Tonya W. An at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Stanford Health CareStanford, CA · Acute Care Hospital · CCN 050441
- Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · CCN 050283
Practice locations
Addresses where Tonya W. An is enrolled with Medicare (CMS data updated 2026-10-02).
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Palo Alto
Clinicians with the same Medicare primary specialty in Palo Alto, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Washington University School Of Medicine |
| Graduation year | 2016 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1699292045 |
| 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