Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

303 Diagnostics, LLC

Clinical Medical Laboratory in Aurora, CO · enumerated 2020 · authorized official John Gautereaux, Owner/Lab Director.

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

National Provider Identifier

1750905485

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Registry record

Entity type Organization (Type 2)

Legal business name 303 Diagnostics, LLC

Practice address 2953 S Peoria St Ste 260, Aurora, CO, 80014

Phone (720) 756-1550

Enumeration date May 28, 2020

Last updated in NPPES Jan 23, 2023

Taxonomy & classification

291U00000X Clinical Medical Laboratory Laboratories Primary

Authorized official

Name John Gautereaux

Title Owner/Lab Director

Phone (480) 818-7598

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2023-01-23. Verify at npiregistry.cms.hhs.gov.

Where is 303 Diagnostics, LLC located?

The practice location on file with NPPES is in Aurora, CO.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-01-23.