Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karen Simpson, MD

Dermatology Physician in Brea, CA · enumerated 2005.

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

National Provider Identifier

1376544189

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Registry record

Entity type Individual (Type 1)

Name Karen Simpson

Credential MD

Sex Female

Practice address 955 W Imperial Hwy Ste 200, Brea, CA, 92821

Phone (714) 626-6310

Fax (714) 626-6320

Enumeration date Aug 2, 2005

Last updated in NPPES Nov 10, 2021

Taxonomy & licenses

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License G75453 (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 Simpson practice?

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

What is the NPI number for Karen Simpson?

The National Provider Identifier (NPI) for Karen Simpson is 1376544189, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Aeri Kang Internal Medicine Physician · Brea, CA NPI 1689660755 Marlene Mires Family Medicine Physician · Brea, CA NPI 1235185976 Biren Shah Family Medicine Physician · Brea, CA NPI 1710086533 Barbara Niklas Pediatric Nurse Practitioner · Brea, CA NPI 1053446617 Jessica Tucker Family Medicine Physician · Brea, CA NPI 1790940203 Trang Phan Physician Assistant · Brea, CA NPI 1891094611 James Yoon Family Medicine Physician · Brea, CA NPI 1083041503 Alexandra Edelman Dermatology Physician · Brea, CA NPI 1700240249

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-11-10.