Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Tammy Ann Guidi, COUNSELOR

Adult Companion in Vallejo, CA · enumerated 2007.

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

National Provider Identifier

1609077320

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Registry record

Entity type Individual (Type 1)

Name Mrs. Tammy Ann Guidi

Credential COUNSELOR

Sex Female

Practice address 355 Tuolumne St, Vallejo, CA, 94590

Phone (707) 759-0272

Enumeration date May 30, 2007

Last updated in NPPES Aug 14, 2025

Taxonomy & licenses

101Y00000X Counselor Behavioral Health & Social Service Providers Secondary

172V00000X Community Health Worker Other Service Providers Secondary

372600000X Adult Companion Nursing Service Related 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

What specialty is Tammy Guidi?

Tammy Guidi is registered in NPPES with the primary taxonomy of Adult Companion. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-14.