Quick answers
- Where does William Duan see patients?
- Medicare's clinician data lists 3 practice locations, including Sacramento, CA, Fremont, CA and Pasadena, CA. Call before your visit to confirm the address.
- What is William Duan's specialty?
- Medicare lists Psychiatry as the primary specialty.
- Does William Duan accept Medicare assignment?
- Medicare's clinician data says William Duan may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is William Duan's NPI number?
- 1881334308. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where William Duan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1215 O St, Ms 3Sacramento, CA 95814
- 48540 Spokane RdFremont, CA 94539
- PO BoxPasadena, CA 91189
Specialties
- Psychiatryprimary
Other psychiatrists in Sacramento
Clinicians with the same Medicare primary specialty in Sacramento, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2022 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1881334308 |
| 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
- 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