Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jonathan M. Stein, M.D.

Anesthesiology Physician in Worcester, MA · enumerated 2005.

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

National Provider Identifier

1285616268

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Registry record

Entity type Individual (Type 1)

Name Jonathan M. Stein

Credential M.D.

Sex Male

Practice address 55 Lake Ave N, Department of Anesthesiology, Worcester, MA, 01655

Phone (508) 334-3271

Fax (508) 856-5911

Enumeration date Nov 16, 2005

Last updated in NPPES Dec 1, 2020

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License 45220 (MA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
6170994	Medicaid	MA	-

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 Jonathan Stein's NPI record?

Cross-check NPI 1285616268 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1285616268 active?

Yes, as of the latest NPPES snapshot, NPI 1285616268 is active (record last updated 2020-12-01).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-12-01.