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

Dr. William Berkowitz, D.C.

Chiropractor in Atascadero, CA · enumerated 2007.

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

National Provider Identifier

1144352055

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Registry record

Entity type Individual (Type 1)

Name Dr. William Berkowitz

Credential D.C.

Sex Male

Practice address Atascadero, CA, 93422

Phone (805) 466-6378

Fax (805) 466-8058

Enumeration date Mar 9, 2007

Last updated in NPPES Sep 16, 2020

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

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 17010 (CA) Primary

DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC 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 NPI 1144352055 active?

Yes, as of the latest NPPES snapshot, NPI 1144352055 is active (record last updated 2020-09-16).

How do I verify William Berkowitz's NPI record?

Cross-check NPI 1144352055 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Jon Wells Chiropractor · Atascadero, CA NPI 1831249945 Darren Hart Chiropractor · Atascadero, CA NPI 1275666034

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-09-16.