John J.k. Loh, M.D.
Radiation Oncology Physician · Laguna Woods, CA
John J.k. Loh, M.D. is a radiation oncology physician with a practice address in Laguna Woods, California, and NPI 1114197472, issued on Mar 3, 2008. Check the license (California A36765, 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 J.k. Loh
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- A36765 CA
58968 MN
4301042942 MI
144774 NY
Self-reported in NPPES; status is on the state search - Practice location
- 4009 Calle Sonora Oeste Unit 3E, Laguna Woods, CA 92637
- Phone
- (315) 491-3997
- Enumerated
- Mar 3, 2008
- Record last updated
- Jul 21, 2022
- Medicaid ID
- 02985422 NY
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Verify John J.k. Loh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A36765Check 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 J.k. Loh among 735 radiation oncology physician records in California
John J.k. Loh, M.D. is one of 735 radiation oncology physician records with a practice address in California. 83% 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 2008, is newer than 57% of them.
- NPI issued2008 · 57% of these records are older, 38% newer
- In a Medicare fileNo · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 74% of these records are
- Record last updated2022 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in California
There are 735 radiation oncology physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 735 in California → Every provider in Laguna Woods → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Linda Chan, M.D.Laguna Hills, CA 926531083844427
- Joel Cherlow, M.D., PH.D.Laguna Hills, CA 926531194736710
- Robert Kwon, MDLaguna Hills, CA 926531841294337
- Andrew Zhang, MDLaguna Hills, CA 926531821417627
- Colton Ladbury, MDIrvine, CA 926181891256756
- Percy Lee, M.D.Irvine, CA 926181447442504
- Harry Moyses, M.D.Irvine, CA 926181376522300
- Selamawit Negusse, MDIrvine, CA 926181316144041
Common questions
What is John J.k. Loh, M.D.'s NPI number?
John J.k. Loh, M.D.'s National Provider Identifier (NPI) is 1114197472, issued on Mar 3, 2008. An NPI identifies a provider in billing; it is not a license.
Where is John J.k. Loh, M.D. located?
The NPPES record lists a practice address at 4009 Calle Sonora Oeste Unit 3E, Laguna Woods, CA, 92637. Phone: (315) 491-3997. Providers update this record themselves, so call before visiting.
How can I verify John J.k. Loh, M.D.'s license?
NPPES lists California license number A36765, 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.