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

Dr. Frederick G. Leidal, PH.D.

Clinical Neuropsychologist in Denver, CO · enumerated 2009.

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

National Provider Identifier

1366675241

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Registry record

Entity type Individual (Type 1)

Name Dr. Frederick G. Leidal

Credential PH.D.

Sex Male

Practice address Denver, CO, 80237

Phone (720) 489-7756

Fax (866) 836-3632

Enumeration date Aug 26, 2009

Last updated in NPPES Apr 17, 2020

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

Taxonomy & licenses

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 4168 (OH) Secondary

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 2301 (CO) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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 1366675241 active?

Yes, as of the latest NPPES snapshot, NPI 1366675241 is active (record last updated 2020-04-17).

How do I verify Frederick Leidal's NPI record?

Cross-check NPI 1366675241 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 2020-04-17.