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

Karl Robert Hamm, O.D.

Q: What is the NPI number for Karl Hamm?

The National Provider Identifier (NPI) for Karl Hamm is 1093852105, a Type 1 (individual) record in the CMS NPPES registry.

Optometrist in Yuba City, CA · enumerated 2007.

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

National Provider Identifier

1093852105

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Registry record

Entity type Individual (Type 1)

Name Karl Robert Hamm

Credential O.D.

Sex Male

Practice address Yuba City, CA, 95991

Phone (530) 755-0222

Enumeration date Jan 30, 2007

Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 8481T (CA) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
SD0084810	Other	CA	MCL NUMBER

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 Karl Hamm practice?

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

What is the NPI number for Karl Hamm?

The National Provider Identifier (NPI) for Karl Hamm is 1093852105, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.