Ralph Jan Koek, M.D.
Psychiatry Physician · Calabasas, CA
Ralph Jan Koek, M.D. is a psychiatry physician with a practice address in Calabasas, California, and NPI 1356428924, issued on Nov 1, 2006. Check the license (California G058707, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ralph Jan Koek
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G058707 CA
Self-reported in NPPES; status is on the state search - Practice location
- 26585 West Agoura Blvd., Calabasas, CA 91301
- Phone
- (818) 876-1050
- Enumerated
- Nov 1, 2006
- Record last updated
- Oct 27, 2022
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Verify Ralph Jan Koek in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G058707Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 91.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Ralph Jan Koek among 8,673 psychiatry physician records in California
Ralph Jan Koek, M.D. is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2022 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
18 psychiatry physician records list a practice address in Calabasas
They are 18 of the 786 NPPES records with a practice address in Calabasas, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Calabasas → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Samieh AskariAgoura Hills, CA 913011629467386
- Ashley BenjaminAgoura Hills, CA 913011558383059
- Faye Brownfield, MDAgoura, CA 913011164598017
- Colin Dias, M.D.Agoura Hills, CA 913011811029168
- Rajiv Kumar, M.D.Agoura Hills, CA 913011689681173
- Christopher Levy, MDAgoura Hills, CA 913011184200925
- Daljit Mac, M.D.Agoura Hills, CA 913011871500363
- Akikur Mohammad, M.D.Agoura Hills, CA 913011306956271
Common questions
What is Ralph Jan Koek, M.D.'s NPI number?
Ralph Jan Koek, M.D.'s National Provider Identifier (NPI) is 1356428924, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ralph Jan Koek, M.D. located?
The NPPES record lists a practice address at 26585 West Agoura Blvd., Calabasas, CA, 91301. Phone: (818) 876-1050. Providers update this record themselves, so call before visiting.
How can I verify Ralph Jan Koek, M.D.'s license?
NPPES lists California license number G058707, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Ralph Jan Koek, M.D.'s MIPS final score?
The 2023 MIPS final score is 91.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.