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

Dr. Dennis Joseph Barker, D.C.

Chiropractor in Walnut Creek, CA · enumerated 2006 · practices at Barker Chiropractic Inc.

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

National Provider Identifier

1477640209

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Registry record

Entity type Individual (Type 1)

Name Dr. Dennis Joseph Barker

Credential D.C.

Sex Male

Practice address Walnut Creek, CA, 94595

Phone (925) 210-8000

Fax (925) 935-0960

Enumeration date Oct 5, 2006

Last updated in NPPES Sep 6, 2023

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

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 21640 (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.

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Frequently asked questions

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.

What specialty is Dennis Barker?

Dennis Barker is registered in NPPES with the primary taxonomy of Chiropractor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Barker Chiropractic Inc Chiropractor · Walnut Creek, CA NPI 1609393677

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-09-06.