Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

John J. Mazzucco, MD, LLC

Health Service Clinic/Center in Waterbury, CT · enumerated 2007 · authorized official John Mazzucco, Manager.

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

National Provider Identifier

1275721557

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Registry record

Entity type Organization (Type 2)

Legal business name John J. Mazzucco, MD, LLC

Practice address 1211 W Main St, Waterbury, CT, 06708

Phone (203) 757-1580

Fax (203) 573-6090

Enumeration date Oct 11, 2007

Last updated in NPPES Oct 11, 2007

Taxonomy & classification

261QH0100X Health Service Clinic/Center Ambulatory Health Care Facilities · License 031891 (CT) Primary

Authorized official

Name John Mazzucco

Title Manager

Phone (203) 757-1580

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2007-10-11. Verify at npiregistry.cms.hhs.gov.

Where is John J. Mazzucco, MD, LLC located?

The practice location on file with NPPES is in Waterbury, CT.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-11.