Carolyn Siu
Physician Assistant · San Mateo, CA
Carolyn Siu is a physician assistant with a practice address in San Mateo, California, and NPI 1679304448, issued on Aug 12, 2024. Check the license (California PA65879, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Carolyn Siu
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA65879 CA
Self-reported in NPPES; status is on the state search - Practice location
- 50 S San Mateo Dr FL 4, San Mateo, CA 94401
- Phone
- (650) 652-8500
- Enumerated
- Aug 12, 2024
- Record last updated
- Jan 13, 2026
- Fax
- (650) 652-8501
- Medicare enrollment
- Enrolled (PECOS I20250314000094); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Verify Carolyn Siu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA65879Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Sutter Bay Medical FoundationSan Mateo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Physician Assistant providers in California
There are 14,451 physician assistant records in California.
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Common questions
What is Carolyn Siu's NPI number?
Carolyn Siu's National Provider Identifier (NPI) is 1679304448, issued on Aug 12, 2024. An NPI identifies a provider in billing; it is not a license.
Where is Carolyn Siu located?
The NPPES record lists a practice address at 50 S San Mateo Dr FL 4, San Mateo, CA, 94401. Phone: (650) 652-8500. Providers update this record themselves, so call before visiting.
How can I verify Carolyn Siu's license?
NPPES lists California license number PA65879, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.