Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Bart M Pasternak, M.D.

Surgery Physician in Westport, CT · enumerated 2009.

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

National Provider Identifier

1831424837

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Registry record

Entity type Individual (Type 1)

Name Bart M Pasternak

Credential M.D.

Sex Male

Practice address Westport, CT, 06880

Phone (203) 259-2923

Enumeration date Oct 8, 2009

Last updated in NPPES Oct 8, 2009

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 021766 (CT) 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

Where does Bart Pasternak practice?

The practice location on file with NPPES is in Westport, CT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Bart Pasternak?

The National Provider Identifier (NPI) for Bart Pasternak is 1831424837, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-10-08.