Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Barry Z Izenstein, M.D.

Endocrinology, Diabetes & Metabolism Physician in Springfield, MA · enumerated 2005.

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

National Provider Identifier

1346237583

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Registry record

Entity type Individual (Type 1)

Name Dr. Barry Z Izenstein

Credential M.D.

Sex Male

Practice address 2 Medical Center Dr, Suite 210, Springfield, MA, 01107

Phone (413) 734-4667

Fax (413) 737-1930

Enumeration date Oct 3, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 39301 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1346237583 active?

Yes, as of the latest NPPES snapshot, NPI 1346237583 is active (record last updated 2007-07-08).

How do I verify Barry Izenstein's NPI record?

Cross-check NPI 1346237583 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.