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

Mr. Alden Marc Cass, PSY.D

Cognitive & Behavioral Psychologist in Nyc, NY · enumerated 2015.

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

National Provider Identifier

1639555907

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Registry record

Entity type Individual (Type 1)

Name Mr. Alden Marc Cass

Credential PSY.D

Sex Male

Practice address Nyc, NY, 10017

Phone (646) 600-9011

Fax (646) 202-9610

Enumeration date Aug 10, 2015

Last updated in NPPES Oct 27, 2021

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

Taxonomy & licenses

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers · License 015595 (NY) Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD 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 1639555907 active?

Yes, as of the latest NPPES snapshot, NPI 1639555907 is active (record last updated 2021-10-27).

How do I verify Alden Cass's NPI record?

Cross-check NPI 1639555907 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 2021-10-27.