Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. WILLIAM H. GEIGER M.D.
NPI 1780687202
Psychiatry & Neurology - Psychiatry in San Luis Obispo, CA

Q: What is William Geiger's NPI number?

The NPI number for William Geiger is 1780687202. It was assigned to this individual provider in the NPPES registry on May 30, 2005.

Q: What is William Geiger's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Q: When was this NPI record last updated?

The NPPES record for William Geiger was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 43 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since May 30, 2005

138 RAMONA DR, SAN LUIS OBISPO, CA 93405(805) 543-1382 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

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About Dr. William H. Geiger M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. WILLIAM H. GEIGER M.D. (NPI 1780687202) is an individual psychiatry provider in San Luis Obispo, California, licensed in California (C020773) and active in the NPI registry since May 2005.

NPPES Registry Identity

NPI1780687202

Entity TypeIndividualMale

Primary Taxonomy2084P0800X

Provider Legal NameDR. WILLIAM H. GEIGERCredential: M.D.

Location Address138 RAMONA DRSan Luis Obispo, CA 93405-1556

Mailing Address138 Ramona DrSan Luis Obispo, CA 93405-1556 · (805) 543-1382

Phone(805) 543-1382

Sole ProprietorNo

Enumeration DateMay 30, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1780687202 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians

Taxonomy Code2084P0800X

License✔ Licensed in CA · C020773

Definition

A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

138 RAMONA DR, San Luis Obispo, CA 93405

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Other Identifiers 1

OtherC20773CA · State License Number

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Geiger's NPI number?

The NPI number for William Geiger is 1780687202. It was assigned to this individual provider in the NPPES registry on May 30, 2005.

Where is William Geiger located?

William Geiger practices at 138 Ramona Dr, San Luis Obispo, CA 93405. The listed phone number is (805) 543-1382.

What is William Geiger's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

When was this NPI record last updated?

The NPPES record for William Geiger was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 43 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.