Stephen J. Soto De Mayor, PA
Physician Assistant · Riverside, CA
Stephen J. Soto De Mayor, PA is a physician assistant with a practice address in Riverside, California, and NPI 1851450571, issued on Dec 8, 2006. Check the license (California PA11778, 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
- Stephen J. Soto De Mayor
- Credential
- PA
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA11778 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10800 Magnolia Ave, Riverside, CA 92505
- Phone
- (909) 353-2000
- Enumerated
- Dec 8, 2006
- Record last updated
- Sep 23, 2008 (not updated in 18 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Also registered at 10800 Magnolia Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Alfredo Aguiar, PAPhysician Assistant1043368970
- Michael Aguinaldo, M.D.Pediatrics Physician1851531487
- Maria Aguirre, MDPediatrics Physician1295806255
Verify Stephen J. Soto De Mayor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA11778Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
164 physician assistant records list a practice address in Riverside
They are 164 of the 13,893 NPPES records with a practice address in Riverside, and 14,451 physician assistant records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 164 in Riverside → All 14,451 in California → Every provider in Riverside →
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Common questions
What is Stephen J. Soto De Mayor, PA's NPI number?
Stephen J. Soto De Mayor, PA's National Provider Identifier (NPI) is 1851450571, issued on Dec 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen J. Soto De Mayor, PA located?
The NPPES record lists a practice address at 10800 Magnolia Ave, Riverside, CA, 92505. Phone: (909) 353-2000. Providers update this record themselves, so call before visiting.
How can I verify Stephen J. Soto De Mayor, PA's license?
NPPES lists California license number PA11778, 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.