Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Doreen Robyn Landrum, PHD

Clinical Psychologist in Austin, TX · enumerated 2006.

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

National Provider Identifier

1598871121

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Registry record

Entity type Individual (Type 1)

Name Dr. Doreen Robyn Landrum

Credential PHD

Sex Female

Practice address 1500 W 38th St, Suite 53, Austin, TX, 78731

Phone (512) 377-2500

Enumeration date Aug 23, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 31351 (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

Is NPI 1598871121 active?

Yes, as of the latest NPPES snapshot, NPI 1598871121 is active (record last updated 2007-07-08).

How do I verify Doreen Landrum's NPI record?

Cross-check NPI 1598871121 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 2007-07-08.