William A. Sia, NP-C
Family Nurse Practitioner · Upland, CA
William A. Sia, NP-C is a family nurse practitioner with a practice address in Upland, California, and NPI 1679063945, issued on May 13, 2018. Check the license (California F03180293, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William A. Sia
- Credential
- NP-C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- F03180293 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1382 E Foothill Blvd, Upland, CA 91786
- Phone
- (909) 982-6500
- Enumerated
- May 13, 2018
- Record last updated
- Sep 12, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (909) 920-0406
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 16,966 in California → Look up another NPI →
Also registered at 1382 E Foothill Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rushmi Reehal, PA-CPhysician Assistant1780959742
Verify William A. Sia in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license F03180293Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William A. Sia among 16,966 family nurse practitioner records in California
William A. Sia, NP-C is one of 16,966 family nurse practitioner records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2018, is newer than 45% of them.
- NPI issued2018 · 45% of these records are older, 50% newer
- In a Medicare fileNo · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 40% of these records are
- Record last updated2019 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
80 family nurse practitioner records list a practice address in Upland
They are 80 of the 1,846 NPPES records with a practice address in Upland, and 16,966 family nurse practitioner records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 16,966 in California → Every provider in Upland → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Karen Allgaier, FNPUpland, CA 917861629220629
- Julie Anderson-Canizales, NPUpland, CA 917861982941811
- Kay Crawford, NPUpland, CA 917861205115425
- Veronica Dallal-Aryan, FNPUpland, CA 917861831521681
- Johnny Dauz, FNP-CUpland, CA 917861528342607
- Eduardo Garcia, FNPUpland, CA 917861316287022
- Annette Hollenbeck, NPUpland, CA 917861831366236
- Renee Johnson, MSN, RN, FNPUpland, CA 917861235498304
Common questions
What is William A. Sia, NP-C's NPI number?
William A. Sia, NP-C's National Provider Identifier (NPI) is 1679063945, issued on May 13, 2018. An NPI identifies a provider in billing; it is not a license.
Where is William A. Sia, NP-C located?
The NPPES record lists a practice address at 1382 E Foothill Blvd, Upland, CA, 91786. Phone: (909) 982-6500. Providers update this record themselves, so call before visiting.
How can I verify William A. Sia, NP-C's license?
NPPES lists California license number F03180293, 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. 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.