NPI Portal NPI Lookup & Verification

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

Mary Suzanne Nguyen, M.D.

Family Medicine Physician in Castroville, TX · enumerated 2005.

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

National Provider Identifier

1356339717

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Registry record

Entity type Individual (Type 1)
Name Mary Suzanne Nguyen
Credential M.D.
Sex Female
Practice address Castroville, TX, 78009
Phone (830) 538-2254
Fax (830) 931-2259
Enumeration date Oct 10, 2005
Last updated in NPPES May 21, 2013

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

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License K5365 (TX) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
0100RE Other TX BCBS

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

Where does Mary Nguyen practice?
The practice location on file with NPPES is in Castroville, TX. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mary Nguyen?
The National Provider Identifier (NPI) for Mary Nguyen is 1356339717, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-05-21.