Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Diana Marithe Guerra

Nutritionist in San Mateo, CA · enumerated 2026.

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

National Provider Identifier

1255283685

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Registry record

Entity type Individual (Type 1)

Name Ms. Diana Marithe Guerra

Sex Female

Practice address 3050 S Delaware St Ste 130, San Mateo, CA, 94403

Phone (650) 319-8654

Enumeration date Feb 10, 2026

Last updated in NPPES Feb 10, 2026

Taxonomy & licenses

133N00000X Nutritionist Dietary & Nutritional Service Providers 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

Is NPI 1255283685 active?

Yes, as of the latest NPPES snapshot, NPI 1255283685 is active (record last updated 2026-02-10).

How do I verify Diana Guerra's NPI record?

Cross-check NPI 1255283685 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-02-10.