Dr. Gregory K. Penniston, D.C.

Dr. Gregory K. Penniston is a Chiropractor provider (Chiropractor) practicing in Tucson, AZ, registered in the NPPES registry with NPI 1356453047 since 2006. The credential DC stands for Doctor of Chiropractic.

✓ Active NPI ✓ Valid NPI checksum

NPI	1356453047
Entity type	Individual (Type 1)
Name	Dr. Gregory K. Penniston
Credential	D.C.
Sex	Male
Practice address	6563 E 22ND ST, Tucson, AZ, 85710
Phone	5207458101
Enumeration date	2006-08-31
Last updated in NPPES	2007-07-08

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
111N00000X	Chiropractor	Primary	3199	AZ

DC — Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

Copy-ready billing details

Provider: Gregory Penniston, D.C.
NPI: 1356453047
Taxonomy: 111N00000X (Chiropractor)
Address: 6563 E 22ND ST, Tucson, AZ, 85710

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1821108119	Lifeline Chiropractic, P.C.	Organization	Chiropractor	Tucson, AZ
1861052086	Edward Sommer LLC	Organization	Home Health Agency	Tucson, AZ
1982373577	Tender Touch Hospice Care LLC	Organization	Community Based Hospice Care Agency	Tucson, AZ
1831919067	Essence Hospice Care of Arizona LLC	Organization	Community Based Hospice Care Agency	Tucson, AZ

Verify this record

Cross-check NPI 1356453047 against the authoritative CMS record: view Dr. Gregory K. Penniston on the official NPPES registry .

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 or validate an NPI number.

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 Gregory Penniston?

Gregory Penniston 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.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.