Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Guillermo L Montanez Jr., MD

Specialist in Mcallen, TX · enumerated 2006.

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

National Provider Identifier

1902878721

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Registry record

Entity type Individual (Type 1)

Name Dr. Guillermo L Montanez Jr.

Credential MD

Sex Male

Practice address 1200 E Savannah Ave, Suite 18, Mcallen, TX, 78503

Phone (956) 631-8354

Fax (956) 631-8441

Enumeration date Feb 6, 2006

Last updated in NPPES Jul 18, 2008

Taxonomy & licenses

174400000X Specialist Other Service Providers · License H3711 (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
135513309	Medicaid	TX	-
0071JA	Other	TX	BC/BS OF TEXAS

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 1902878721 active?

Yes, as of the latest NPPES snapshot, NPI 1902878721 is active (record last updated 2008-07-18).

How do I verify Guillermo Montanez's NPI record?

Cross-check NPI 1902878721 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 2008-07-18.