NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Illinois Proton Center LLC

Radiation Oncology Clinic/Center in Warrenville, IL · enumerated 2010 · authorized official Michael Mullen, Vp, Hospital Revenue Cycle, Nmhc.

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

National Provider Identifier

1972824142

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Illinois Proton Center LLC
Other name <Unavail>
Practice address 4455 Weaver Pkwy, Warrenville, IL, 60555
Phone (630) 821-6400
Fax (630) 821-6474
Enumeration date Jun 22, 2010
Last updated in NPPES Feb 12, 2025

Taxonomy & classification

261QX0203X Radiation Oncology Clinic/Center Ambulatory Health Care Facilities Primary

Authorized official

Name Michael Mullen
Title Vp, Hospital Revenue Cycle, Nmhc
Phone (630) 938-6076

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 Illinois Proton Center LLC?
Illinois Proton Center LLC is registered in NPPES as a Radiation Oncology Clinic/Center (its primary provider taxonomy).

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-12.