Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Toxicology Associates Prof LLC

Specialist in Denver, CO · enumerated 2007 · authorized official Su Dierbeck, Administrator.

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

National Provider Identifier

1275749350

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Toxicology Associates Prof LLC

Practice address 2555 S Downing St, Suite 260, Denver, CO, 80210

Phone (303) 765-3800

Fax (303) 765-3804

Enumeration date May 15, 2007

Last updated in NPPES Oct 7, 2009

Taxonomy & classification

174400000X Specialist Other Service Providers · License 22473 (CO) Primary

Authorized official

Name Su Dierbeck

Title Administrator

Phone (303) 765-3800

Other identifiers

Identifier	Type	State	Issuer
01224732	Medicaid	CO	-
01345784	Medicaid	CO	-
01281856	Medicaid	CO	-
92374875	Medicaid	CO	-

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

Where is Toxicology Associates Prof LLC located?

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2009-10-07. Verify at npiregistry.cms.hhs.gov.

Providers at this address

Browse all →

Jeffrey Brent Medical Toxicology (Emergency Medicine) Physician · Denver, CO NPI 1558365114 Kenneth Kulig Medical Toxicology (Emergency Medicine) Physician · Denver, CO NPI 1578533782 Edward Cetaruk Medical Toxicology (Emergency Medicine) Physician · Denver, CO NPI 1578533154 Warren Kortz Surgery Physician · Denver, CO NPI 1851489918 Kathey Spence Physician Assistant · Denver, CO NPI 1073601050 Ryan Gaines Plastic Surgery within the Head & Neck (Otolaryngology) Physician · Denver, CO NPI 1295898187 Nadine Mikhaeel-Kamel Hematology & Oncology Physician · Denver, CO NPI 1316085939 Seth Reiner Radiation Oncology Physician · Denver, CO NPI 1497887624

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-10-07.