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

Mr. Gary D Joslow, MED, PHD CAND

Clinical Psychologist in Lexington, MA · enumerated 2007.

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

National Provider Identifier

1235270943

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Registry record

Entity type Individual (Type 1)

Name Mr. Gary D Joslow

Credential MED, PHD CAND

Sex Male

Practice address Lexington, MA, 02420

Phone (781) 799-0025

Fax (617) 523-1207

Enumeration date Feb 8, 2007

Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 1612 (MA) Primary

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 1235270943 active?

Yes, as of the latest NPPES snapshot, NPI 1235270943 is active (record last updated 2007-07-08).

How do I verify Gary Joslow's NPI record?

Cross-check NPI 1235270943 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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