Quick answers
- Which hospitals does Nancy Chiao-Castle work at?
- Medicare's official clinician data lists Nancy Chiao-Castle at 1 hospital: San Mateo Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nancy Chiao-Castle see patients?
- Medicare's clinician data lists 2 practice locations, including San Mateo, CA and Redwood City, CA. Call before your visit to confirm the address.
- What is Nancy Chiao-Castle's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Nancy Chiao-Castle accept Medicare assignment?
- Yes. Medicare's clinician data says Nancy Chiao-Castle 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 Nancy Chiao-Castle?
- (650) 573-2222, as listed in official Medicare / NPI Registry data.
- What is Nancy Chiao-Castle's NPI number?
- 1578619052. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nancy Chiao-Castle works
Medicare's Facility Affiliation Data lists Nancy Chiao-Castle at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- San Mateo Medical CenterSan Mateo, CA · Acute Care Hospital · CCN 050113
Practice locations
Addresses where Nancy Chiao-Castle is enrolled with Medicare (CMS data updated 2026-10-02).
- 222 W 39th AveSan Mateo, CA 94403 (650) 573‑2222
- 2710 Middlefield RdRedwood City, CA 94063 (650) 573‑2222
Group practices
Medicare enrollment lists Nancy Chiao-Castle as a member of this group (CMS data updated 2026-10-02).
- County of San Mateo310 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in San Mateo
Clinicians with the same Medicare primary specialty in San Mateo, CA — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 1999 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578619052 |
| 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