Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Allen Dennis, D.C.

Chiropractor in Pasadena, TX · enumerated 2010.

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

National Provider Identifier

1821315656

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Allen Dennis

Credential D.C.

Sex Male

Practice address 4500 E Sam Houston Pkwy S, Ste 115, Pasadena, TX, 77505

Phone (281) 991-3002

Fax (281) 991-3022

Enumeration date May 4, 2010

Last updated in NPPES Jun 22, 2011

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 11418 (TX) 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

What specialty is Mark Dennis?

Mark Dennis 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.

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 2011-06-22.