Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Johanna Mayer, PHD

Psychologist in Portola Valley, CA · enumerated 2007 · practices at Richard H. Laude, M.D., Inc..

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1114054335

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Johanna Mayer

Credential PHD

Sex Female

Practice address Portola Valley, CA, 94028

Phone (650) 851-1164

Enumeration date Feb 27, 2007

Last updated in NPPES Jun 10, 2010

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY5817 (CA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
151141	Other	CA	VALUE OPTIONS PROVIDER #

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Johanna Mayer?

Johanna Mayer is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Katherine Ohanlan Gynecologic Oncology Physician · Portola Valley, CA NPI 1467486407 Kerry Kravitz Psychiatry Physician · Portola Valley, CA NPI 1225132269 Leslie Hsu Psychiatry Physician · Portola Valley, CA NPI 1699846725 Anne Henzel Ophthalmology Physician · Portola Valley, CA NPI 1942355953 Richard Laude Psychiatry Physician · Portola Valley, CA NPI 1932243458 Richard H. Laude, M.D., Inc. Psychiatry Physician · Portola Valley, CA NPI 1588708002

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-06-10.