John Jung Gill Koh, MD
Obstetrics & Gynecology Physician · Simi Valley, CA
John Jung Gill Koh, MD is an obstetrics & gynecology physician with a practice address in Simi Valley, California, and NPI 1841283009, issued on Aug 23, 2005. Check the license (California A31915, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Jung Gill Koh
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A31915 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1147 Red Tail Way, Simi Valley, CA 93065
- Phone
- (805) 527-8055
- Enumerated
- Aug 23, 2005
- Record last updated
- Jun 27, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (805) 520-8849
- Medicaid ID
- 00A319151 CA
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1147 Red Tail Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brittney Ayers, NURSE PRACTITIONERFamily Nurse Practitioner1114454816
- Sarah Garcia, D.O.Obstetrics & Gynecology Physician1790088714
- Catherine Kim, MDObstetrics & Gynecology Physician1972596120
- Ga Lee, M.D.Obstetrics & Gynecology Physician1497918254
- Jennifer Lee, D.O.Obstetrics & Gynecology Physician1033502869
- Gerald Murphy, MDObstetrics & Gynecology Physician1023001286
Verify John Jung Gill Koh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A31915Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Jung Gill Koh among 5,088 obstetrics & gynecology physician records in California
John Jung Gill Koh, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileNo · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2012 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 5,088 in California → Every provider in Simi Valley → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Sarah Garcia, D.O.Simi Valley, CA 930651790088714
- Catherine Kim, MDSimi Valley, CA 930651972596120
- Ga Lee, M.D.Simi Valley, CA 930651497918254
- Jennifer Lee, D.O.Simi Valley, CA 930651033502869
- Gerald Murphy, MDSimi Valley, CA 930651023001286
- Abigail NimzSimi Valley, CA 930651750736260
- Roopa Rao-Karlamangla, M.D.Simi Valley, CA 930651588650865
- Irene Tan, M.D.Simi Valley, CA 930651699942425
Common questions
What is John Jung Gill Koh, MD's NPI number?
John Jung Gill Koh, MD's National Provider Identifier (NPI) is 1841283009, issued on Aug 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John Jung Gill Koh, MD located?
The NPPES record lists a practice address at 1147 Red Tail Way, Simi Valley, CA, 93065. Phone: (805) 527-8055. Providers update this record themselves, so call before visiting.
How can I verify John Jung Gill Koh, MD's license?
NPPES lists California license number A31915, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.