Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Ralph Jan Koek, MD

Individual provider Psychiatry Physician · NPI 1356428924

Dr. Ralph Jan Koek, MD is a Psychiatry Physician in Calabasas, California. Works from 3 locations. Licensed in California.

Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

26585 W Agoura Blvd Ste 330
Calabasas, CA 91301
Phone: (818) 876-1050
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 760 Westwood Plz Ste 58-249c, Los Angeles, CA 90024-5055 — (310) 206-2210
  • 16111 Plummer St, North Hills, CA 91343-2036 — (800) 516-4567

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence G058707 (CA)

Record details

NPI number1356428924
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 1, 2006
Last updated in NPPESOctober 27, 2022
Certification dateOctober 24, 2022

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