NPI Portal NPI Lookup & Verification

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

Mrs. Joanne M Marcus, PA

Physician Assistant in Sunnyvale, CA · enumerated 2008 · practices at Lawrence B Hooper MD Inc.

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

National Provider Identifier

1356507420

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Registry record

Entity type Individual (Type 1)
Name Mrs. Joanne M Marcus
Credential PA
Sex Female
Practice address Sunnyvale, CA, 94087
Phone (408) 245-4048
Fax (408) 245-6131
Enumeration date Jul 29, 2008
Last updated in NPPES Jan 12, 2018

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

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA18562 (CA) Primary
PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

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.

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Frequently asked questions

What is the NPI number for Joanne Marcus?
The National Provider Identifier (NPI) for Joanne Marcus is 1356507420, a Type 1 (individual) record in the CMS NPPES registry.
Where does Joanne Marcus practice?
The practice location on file with NPPES is in Sunnyvale, CA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-12.