Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

The Harold Leever Regional Cancer Center Inc

Radiation Oncology Clinic/Center in Waterbury, CT · enumerated 2006 · authorized official Thomas Belzek, Finance Director.

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

National Provider Identifier

1891727657

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Registry record

Entity type Organization (Type 2)

Legal business name The Harold Leever Regional Cancer Center Inc

Practice address 1075 Chase Pkwy, Waterbury, CT, 06708

Phone (203) 575-5555

Fax (203) 575-5562

Enumeration date Jul 6, 2006

Last updated in NPPES Sep 20, 2012

Taxonomy & classification

261QX0203X Radiation Oncology Clinic/Center Ambulatory Health Care Facilities · License 0377 (CT) Primary

Authorized official

Name Thomas Belzek

Title Finance Director

Phone (203) 575-5563

Other identifiers

Identifier	Type	State	Issuer
2685544	Other	CT	AETNA
68RDONC02CT01	Other	CT	ANTHEM
4239712	Medicaid	CT	-

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 The Harold Leever Regional Cancer Center Inc?

NPPES lists Thomas Belzek (Finance Director) as the authorized official for this organization.

What is the NPI number for The Harold Leever Regional Cancer Center Inc?

The NPI for The Harold Leever Regional Cancer Center Inc is 1891727657, 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 2012-09-20.