Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Edward Kolbusz

Specialist in Downers Grove, IL · enumerated 2006.

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

National Provider Identifier

1366550485

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. William Edward Kolbusz

Sex Male

Practice address 1034 Warren Ave, Downers Grove, IL, 60515

Phone (630) 964-3839

Fax (630) 964-5105

Enumeration date Aug 28, 2006

Last updated in NPPES Dec 18, 2007

Taxonomy & licenses

174400000X Specialist Other Service Providers Primary

Other identifiers

Identifier	Type	State	Issuer
0202290459	Other	IL	ASSURANT HEALTH
202290459 0001	Other	IL	CIGNA ID
63310	Other	IL	ADVOCATE HEALTH PARTNERS
0002232794	Other	IL	BLUE CROSS BLUE SHIELD ID
0202290459	Other	IL	TIME INSURANCE COMPANY

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

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.

What specialty is William Kolbusz?

William Kolbusz is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-12-18.