Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Seoni Joanna Llanes, PH.D.

Clinical Neuropsychologist in Stanford, CA · enumerated 2006.

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

National Provider Identifier

1659431302

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Registry record

Entity type Individual (Type 1)

Name Dr. Seoni Joanna Llanes

Credential PH.D.

Sex Female

Practice address 300 Pasteur Dr Rm H3109, Neurology and Neurological Services, Stanford, CA, 94305

Phone (650) 498-7875

Fax (650) 498-7868

Enumeration date Dec 11, 2006

Last updated in NPPES Jan 9, 2009

Taxonomy & licenses

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License PSY20364 (CA) 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

What specialty is Seoni Llanes?

Seoni Llanes is registered in NPPES with the primary taxonomy of Clinical Neuropsychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-01-09.