Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Radiation Oncology Consultants, Ltd

Q: What is the NPI number for Radiation Oncology Consultants, Ltd?

The NPI for Radiation Oncology Consultants, Ltd is 1164412417, a Type 2 (organization) record in the CMS NPPES registry.

Radiation Oncology Physician in Oak Brook, IL · enumerated 2005 · authorized official William Hartsell, President.

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

National Provider Identifier

1164412417

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Registry record

Entity type Organization (Type 2)

Legal business name Radiation Oncology Consultants, Ltd

Practice address 700 Commerce Dr, Suite 500, Oak Brook, IL, 60523

Phone (847) 698-0600

Fax (847) 698-0601

Enumeration date Oct 27, 2005

Last updated in NPPES Mar 29, 2017

Taxonomy & classification

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 042000055 (IL) Primary

Authorized official

Name William Hartsell

Title President

Phone (847) 698-0600

Other identifiers

Identifier	Type	State	Issuer
01615044	Other	-	BLUE SHIELD PIN
CN5041	Other	-	RAILROAD MEDICARE PIN
62105	Other	-	ADVOCATE PHO GROUP
L007019	Other	-	CHAMPUS PIN

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.

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Frequently asked questions

Who is the authorized official for Radiation Oncology Consultants, Ltd?

NPPES lists William Hartsell (President) as the authorized official for this organization.

What is the NPI number for Radiation Oncology Consultants, Ltd?

The NPI for Radiation Oncology Consultants, Ltd is 1164412417, a Type 2 (organization) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-03-29.