Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Colorado Gastroenterology Prof LLC

Gastroenterology Physician in Denver, CO · enumerated 2006 · authorized official Kevin Sieja, Managing Physician.

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

National Provider Identifier

1396790101

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Registry record

Entity type Organization (Type 2)

Legal business name Colorado Gastroenterology Prof LLC

Practice address 1960 N Ogden St Ste 220, Denver, CO, 80218

Phone (303) 861-0808

Fax (303) 861-2193

Enumeration date May 23, 2006

Last updated in NPPES Apr 21, 2025

Taxonomy & classification

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Kevin Sieja

Title Managing Physician

Phone (303) 861-0808

Other identifiers

Identifier	Type	State	Issuer
9000152752	Medicaid	CO	-
DB9573	Other	CO	RAILROAD MEDICARE

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 → Validate an NPI →

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 2025-04-21. Verify at npiregistry.cms.hhs.gov.

Where is Colorado Gastroenterology Prof LLC located?

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

Providers at this address

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Kevin Rufner Gastroenterology Physician · Denver, CO NPI 1427195718 Gi Alliance Anesthesia of Colorado Certified Registered Nurse Anesthetist · Denver, CO NPI 1831828573

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-21.