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

Dr. Joyce L. Doncaster, PHD

Clinical Psychologist in Katy, TX · enumerated 2010.

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

National Provider Identifier

1649574153

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Registry record

Entity type Individual (Type 1)

Name Dr. Joyce L. Doncaster

Credential PHD

Sex Female

Practice address Katy, TX, 77494

Phone (979) 450-8454

Enumeration date Dec 28, 2010

Last updated in NPPES Dec 28, 2010

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

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 25578 (TX) Secondary

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers · License 25578 (TX) Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 25578 (TX) 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

Where does Joyce Doncaster practice?

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

What is the NPI number for Joyce Doncaster?

The National Provider Identifier (NPI) for Joyce Doncaster is 1649574153, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-12-28.