NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Colorado Allergy and Asthma Centers, PC

Specialist in Littleton, CO · enumerated 2021 · authorized official John Milewski, Coo/Chief Operating Officer.

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

National Provider Identifier

1689246274

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Colorado Allergy and Asthma Centers, PC
Practice address 5920 S Estes St Ste 120, Littleton, CO, 80123
Phone (303) 971-0311
Fax (303) 948-0339
Enumeration date Jul 13, 2021
Last updated in NPPES Jul 13, 2021

Taxonomy & classification

174400000X Specialist Other Service Providers Primary

Authorized official

Name John Milewski
Title Coo/Chief Operating Officer
Phone (720) 858-7431

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

What is a Type 2 NPI?
A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.
What type of organization is Colorado Allergy and Asthma Centers, PC?
Colorado Allergy and Asthma Centers, PC is registered in NPPES as a Specialist (its primary provider taxonomy).

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-13.