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

Melissa Diem Vi Nguyen

Speech-Language Assistant in Temecula, CA · enumerated 2022.

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

National Provider Identifier

1861122921

Verified

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Registry record

Entity type Individual (Type 1)

Name Melissa Diem Vi Nguyen

Sex Female

Practice address Temecula, CA, 92590

Phone (951) 556-8157

Enumeration date Jun 13, 2022

Last updated in NPPES Jun 13, 2022

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

Taxonomy & licenses

2355S0801X Speech-Language Assistant Speech, Language and Hearing Service Providers · License 3791 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Melissa Diem Vi Nguyen practice?

The practice location on file with NPPES is in Temecula, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Melissa Diem Vi Nguyen?

The National Provider Identifier (NPI) for Melissa Diem Vi Nguyen is 1861122921, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-06-13.