Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Fabio Alejandro Mazzarelli II, PHYSICIAN ASSISTANT

Physician Assistant in Visalia, CA · enumerated 2017.

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

National Provider Identifier

1821510488

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Registry record

Entity type Individual (Type 1)

Name Fabio Alejandro Mazzarelli II

Credential PHYSICIAN ASSISTANT

Sex Male

Practice address 400 W Mineral King Ave, Visalia, CA, 93291

Phone (559) 624-2000

Enumeration date Jul 14, 2017

Last updated in NPPES Mar 17, 2018

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 55204 (CA) 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 Fabio Mazzarelli?

Fabio Mazzarelli is registered in NPPES with the primary taxonomy of Physician Assistant. 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 2018-03-17.