Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karen D Nicholson, M.D., M.P.H.

Public Health & General Preventive Medicine Physician in San Marcos, CA · enumerated 2006 · practices at Cal State San Marcos Student Health & Counseling Services.

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

National Provider Identifier

1679668297

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Registry record

Entity type Individual (Type 1)

Name Karen D Nicholson

Credential M.D., M.P.H.

Sex Female

Practice address 333 S. Twin Oaks Valley Rd, Cal State San Marcos Shcs, San Marcos, CA, 92096

Phone (760) 750-4920

Fax (760) 750-3181

Enumeration date Oct 3, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

2083P0901X Public Health & General Preventive Medicine Physician Allopathic & Osteopathic Physicians · License G74856 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Karen Nicholson practice?

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

What is the NPI number for Karen Nicholson?

The National Provider Identifier (NPI) for Karen Nicholson is 1679668297, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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