Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

William Bailen

Pharmacist in San Clemente, CA · enumerated 2015.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1649651654

Verified

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Registry record

Entity type Individual (Type 1)

Name William Bailen

Sex Male

Practice address San Clemente, CA, 92673

Phone (949) 369-5596

Fax (949) 369-5691

Enumeration date Jun 16, 2015

Last updated in NPPES Jun 16, 2015

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License 36529 (CA) Primary

Other identifiers

Identifier	Type	State	Issuer
36529	Other	CA	PHARMACIST

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 is the NPI number for William Bailen?

The National Provider Identifier (NPI) for William Bailen is 1649651654, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Bailen practice?

The practice location on file with NPPES is in San Clemente, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2015-06-16.