Ralph Koek, M.D.
NPI 1356428924 · Psychiatry Physician · Calabasas, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ralph Koek, M.D. is a Psychiatry Physician provider in Calabasas, CA (NPI 1356428924).
Provider details
- NPI number
- 1356428924
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G058707 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (2)
- 760 Westwood Plz Ste 58-249cLos Angeles, CA 90024-5055Phone: (310) 206-2210
- 16111 Plummer St(116a-11)North Hills, CA 91343-2036Phone: (800) 516-4567Fax: (818) 895-9588
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2022-10-27
- Certified
- 2022-10-24
Frequently asked questions
- What is Ralph Koek's NPI number?
- Ralph Koek's National Provider Identifier (NPI) is 1356428924, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ralph Koek's specialty?
- Ralph Koek is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Ralph Koek located?
- Ralph Koek's practice location on file with NPPES is 26585 West Agoura Blvd., Calabasas, CA 91301.
- What is Ralph Koek's phone number?
- The practice phone number listed in the NPPES registry for Ralph Koek is (818) 876-1050.
- Does Ralph Koek accept Medicare?
- Ralph Koek is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ralph Koek's NPI active?
- Yes — Ralph Koek's NPI (1356428924) is active in the NPPES registry as of the last update on 2022-10-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.