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

Mario Guerrero, MD

Speech-Language Assistant in San Luis, AZ · enumerated 2021.

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

National Provider Identifier

1477144509

Verified

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Registry record

Entity type Individual (Type 1)

Name Mario Guerrero

Credential MD

Sex Male

Practice address San Luis, AZ, 85336

Phone (928) 323-1442

Enumeration date Feb 1, 2021

Last updated in NPPES Feb 1, 2021

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 SLPA12247 (AZ) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 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 Mario Guerrero?

Mario Guerrero is registered in NPPES with the primary taxonomy of Speech-Language Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-01.