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

Dr. Marilyn Maia Nguyen

Dentist in Fontana, CA · enumerated 2016.

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

National Provider Identifier

1588022065

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Registry record

Entity type Individual (Type 1)
Name Dr. Marilyn Maia Nguyen
Sex Female
Practice address Fontana, CA, 92336
Phone (909) 357-0869
Enumeration date Jan 29, 2016
Last updated in NPPES Jun 16, 2020

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

Taxonomy & licenses

122300000X Dentist Dental Providers · License 101758 (CA) Primary
1223G0001X General Practice Dentistry Dental Providers · License 101758 (CA) Secondary

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

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 Marilyn Nguyen?
Marilyn Nguyen is registered in NPPES with the primary taxonomy of Dentist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-06-16.