NPI Portal NPI Lookup & Verification

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

Mary Ann Chu

Registered Nurse in Rancho Santa Margarita, CA · enumerated 2016.

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

National Provider Identifier

1033663240

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Registry record

Entity type Individual (Type 1)
Name Mary Ann Chu
Sex Female
Practice address Rancho Santa Margarita, CA, 92688
Phone (949) 395-0790
Enumeration date Aug 5, 2016
Last updated in NPPES Aug 5, 2016

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

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 667248 (CA) Primary

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 Mary Ann Chu?
The National Provider Identifier (NPI) for Mary Ann Chu is 1033663240, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mary Ann Chu practice?
The practice location on file with NPPES is in Rancho Santa Margarita, 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 2016-08-05.