Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ann Elizabeth Guarino, RN

Registered Nurse in El Cajon, CA · enumerated 2008.

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

National Provider Identifier

1598939191

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Registry record

Entity type Individual (Type 1)

Name Ann Elizabeth Guarino

Credential RN

Sex Female

Practice address 151 Van Houten Ave, El Cajon, CA, 92020

Phone (619) 401-3711

Fax (619) 401-3886

Enumeration date Apr 15, 2008

Last updated in NPPES Apr 15, 2008

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License 624558 (CA) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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 Ann Guarino?

Ann Guarino is registered in NPPES with the primary taxonomy of Registered Nurse. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-15.