Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alexandra Herrero Leon Guerrero, M.D.

Surgery Physician in Tamuning, GU · enumerated 2013.

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

National Provider Identifier

1780020586

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Registry record

Entity type Individual (Type 1)

Name Dr. Alexandra Herrero Leon Guerrero

Credential M.D.

Sex Female

Practice address 280 Pale San Vitores Rd, Tamuning, GU, 96913

Phone (671) 647-4542

Fax (671) 647-4558

Enumeration date May 20, 2013

Last updated in NPPES Aug 27, 2019

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License M-2170 (GU) 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

How do I verify Alexandra Leon Guerrero's NPI record?

Cross-check NPI 1780020586 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1780020586 active?

Yes, as of the latest NPPES snapshot, NPI 1780020586 is active (record last updated 2019-08-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-08-27.