Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Tamara O'Nan, PA-C

Physician Assistant in Newport Beach, CA · enumerated 2011 · practices at Allied Psychiatry and Mental Health.

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

National Provider Identifier

1477837862

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Registry record

Entity type Individual (Type 1)

Name Tamara O'Nan

Credential PA-C

Sex Female

Practice address 1401 Dove St Ste 420, Newport Beach, CA, 92660

Phone (949) 945-0927

Fax (949) 269-6263

Enumeration date Oct 4, 2011

Last updated in NPPES Mar 12, 2025

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers Secondary

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA21869 (CA) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA21869 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
P01199945	Other	CA	MEDICARE RAILROAD

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

How do I verify Tamara O'Nan's NPI record?

Cross-check NPI 1477837862 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1477837862 active?

Yes, as of the latest NPPES snapshot, NPI 1477837862 is active (record last updated 2025-03-12).

Other providers at this practice address

Browse all →

Melanie Murua Clinical Psychologist · Newport Beach, CA NPI 1548541352 Hadi Estakhri Psychiatry Physician · Newport Beach, CA NPI 1003161522 Allied Psychiatry and Mental Health Psychiatry Physician · Newport Beach, CA NPI 1457829731 Tanvi Patel Clinical Psychologist · Newport Beach, CA NPI 1528698222 Mariam Fazil-Nageer Psychiatric/Mental Health Nurse Practitioner · Newport Beach, CA NPI 1235827429

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-12.