Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Charles Isler III, PHD

Health Service Psychologist in Lackland Afb, TX · enumerated 2006 · practices at Whasc.

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

National Provider Identifier

1699838409

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Registry record

Entity type Individual (Type 1)

Name Dr. William Charles Isler III

Credential PHD

Sex Male

Practice address 1100 Wilford Hall Loop Bldg 4554, Lackland Afb, TX, 78236

Phone (210) 292-6225

Enumeration date Dec 19, 2006

Last updated in NPPES Sep 11, 2019

Taxonomy & licenses

103TH0100X Health Service Psychologist Behavioral Health & Social Service Providers · License 2313 (WA) 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.

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Frequently asked questions

Is NPI 1699838409 active?

Yes, as of the latest NPPES snapshot, NPI 1699838409 is active (record last updated 2019-09-11).

How do I verify William Isler's NPI record?

Cross-check NPI 1699838409 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-09-11.