NPI Portal NPI Lookup & Verification

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

Alexander James Geyer, M.D.

Family Medicine Physician in Corona, CA · enumerated 2016.

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

National Provider Identifier

1053775684

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Registry record

Entity type Individual (Type 1)
Name Alexander James Geyer
Credential M.D.
Sex Male
Practice address Corona, CA, 92883
Phone (951) 493-6921
Fax (951) 826-8157
Enumeration date Apr 10, 2016
Last updated in NPPES Apr 14, 2025

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

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License A154572 (CA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

What is the NPI number for Alexander Geyer?
The National Provider Identifier (NPI) for Alexander Geyer is 1053775684, a Type 1 (individual) record in the CMS NPPES registry.
Where does Alexander Geyer practice?
The practice location on file with NPPES is in Corona, CA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-14.