Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Gregory Thomas Aaron, C.O.

Orthotist in Sacramento, CA · enumerated 2011.

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

National Provider Identifier

1841588092

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Registry record

Entity type Individual (Type 1)

Name Mr. Gregory Thomas Aaron

Credential C.O.

Sex Male

Practice address 2425 Stockton Blvd, #236, Sacramento, CA, 95817

Phone (916) 453-2170

Fax (916) 453-5024

Enumeration date Jul 20, 2011

Last updated in NPPES Jul 20, 2011

Taxonomy & licenses

222Z00000X Orthotist Respiratory, Developmental, Rehabilitative and Restorative Service Providers Primary

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 Gregory Aaron?

Gregory Aaron is registered in NPPES with the primary taxonomy of Orthotist. 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 2011-07-20.