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

Dr. Karen Lynda Sommerfeld, PH.D.

Clinical Psychologist in Escondido, CA · enumerated 2006.

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

National Provider Identifier

1619056132

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Registry record

Entity type Individual (Type 1)

Name Dr. Karen Lynda Sommerfeld

Credential PH.D.

Sex Female

Practice address Escondido, CA, 92025

Phone (760) 739-5212

Enumeration date Nov 3, 2006

Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License PSY13048 (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 is the NPI number for Karen Sommerfeld?

The National Provider Identifier (NPI) for Karen Sommerfeld is 1619056132, a Type 1 (individual) record in the CMS NPPES registry.

Where does Karen Sommerfeld practice?

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

Other providers at this practice address

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William Biffar Clinical Psychologist · Escondido, CA NPI 1104853449

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