Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Physicians for Fitness Inc

Q: What type of organization is Physicians for Fitness Inc?

Physicians for Fitness Inc is registered in NPPES as a Family Medicine Physician (its primary provider taxonomy).

Family Medicine Physician in San Diego, CA · enumerated 2007 · authorized official Guillermo Castillo, Owner.

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

National Provider Identifier

1689707739

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Registry record

Entity type Organization (Type 2)

Legal business name Physicians for Fitness Inc

Practice address 5550 University Ave, San Diego, CA, 92105

Phone (619) 501-0122

Fax (619) 464-1157

Enumeration date Mar 14, 2007

Last updated in NPPES Oct 29, 2007

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Guillermo Castillo

Title Owner

Phone (619) 501-0122

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 type of organization is Physicians for Fitness Inc?

Physicians for Fitness Inc is registered in NPPES as a Family Medicine Physician (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-29.