Johanna Mayer, PHD
Psychologist · Portola Valley, CA
Johanna Mayer, PHD is a psychologist with a practice address in Portola Valley, California, and NPI 1114054335, issued on Feb 27, 2007. Check the license (California PSY5817, 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
- Johanna Mayer
- Credential
- PHD
- Primary taxonomy
- Psychologist 103T00000X
- License number
- PSY5817 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4370 Alpine RD, Portola Valley, CA 94028
- Phone
- (650) 851-1164
- Enumerated
- Feb 27, 2007
- Record last updated
- Jun 10, 2010 (not updated in 16 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Also registered at 4370 Alpine RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Johanna Mayer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PSY5817Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2 psychologist records list a practice address in Portola Valley
They are 2 of the 84 NPPES records with a practice address in Portola Valley, and 7,304 psychologist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2 in Portola Valley → All 7,304 in California → Every provider in Portola Valley →
Other psychologist records in California
- Alice Abarbanel, PH.D.Albany, CA1598095002
- Michael Abbott, PSYDModesto, CA1346498151
- Riley AbelesLos Angeles, CA1841861945
- Jenna Abell, PSYDLos Angeles, CA1073743969
- Sheri Abercrombie, PSY.D.San Diego, CA1932292422
- Tseday Aberra, PSY.D.Corona, CA1104026517
- Elham Abouhamzeh, PSY.DIrvine, CA1386092880
- Lilit Abraamyan-ChaidezBurbank, CA1710433289
- Mackenzie Abraham, PHDRedondo Beach, CA1881053833
- Sandra Abraham, PSYDSanta Fe Springs, CA1427467851
Common questions
What is Johanna Mayer, PHD's NPI number?
Johanna Mayer, PHD's National Provider Identifier (NPI) is 1114054335, issued on Feb 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Johanna Mayer, PHD located?
The NPPES record lists a practice address at 4370 Alpine RD, Portola Valley, CA, 94028. Phone: (650) 851-1164. Providers update this record themselves, so call before visiting.
How can I verify Johanna Mayer, PHD's license?
NPPES lists California license number PSY5817, 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.