Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Joseph Mazzucco, M.D.

Surgery Physician in Holyoke, MA · enumerated 2005 · practices at Pioneer Valley Eye Associates, PC.

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

National Provider Identifier

1275515322

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Registry record

Entity type Individual (Type 1)

Name Dr. John Joseph Mazzucco

Credential M.D.

Sex Male

Practice address 2 Hospital Dr, Suite 203, Holyoke, MA, 01040

Phone (413) 540-5048

Fax (413) 540-5049

Enumeration date Nov 15, 2005

Last updated in NPPES Jun 18, 2015

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 031891 (CT) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 262537 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 do I verify John Mazzucco's NPI record?

Cross-check NPI 1275515322 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1275515322 active?

Yes, as of the latest NPPES snapshot, NPI 1275515322 is active (record last updated 2015-06-18).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-06-18.