Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Karen Eva Halldorsdottir, MD
Neurology Physician in Orange, CA · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1669964540
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Registry record
Entity type Individual (Type 1)
Name Karen Eva Halldorsdottir
Credential MD
Sex Female
Practice address 200 S Manchester Ave Ste 110, Orange, CA, 92868
Phone (714) 456-2332
Enumeration date Jun 5, 2018
Last updated in NPPES Oct 10, 2023
Taxonomy & licenses
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.
Frequently asked questions
What is the NPI number for Karen Halldorsdottir?
The National Provider Identifier (NPI) for Karen Halldorsdottir is 1669964540, a Type 1 (individual) record in the CMS NPPES registry.
Where does Karen Halldorsdottir practice?
The practice location on file with NPPES is in Orange, CA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-10.