David Chia-Ont Khan, MD
Radiation Oncology Physician · El Segundo, CA
David Chia-Ont Khan, MD is a radiation oncology physician with a practice address in El Segundo, California, and NPI 1649274150, issued on Jun 13, 2005. Check the license (California A65774, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David Chia-Ont Khan
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A65774 CA
Self-reported in NPPES; status is on the state search - Practice location
- 860 Parkview Drive North, El Segundo, CA 90245
- Phone
- (310) 414-9990
- Enumerated
- Jun 13, 2005
- Record last updated
- Nov 12, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (310) 943-2703
- Medicaid ID
- 00A657740 CA
- Medicare enrollment
- Enrolled (PECOS I20041001000509); accepts Medicare assignment
- Medical or professional school
- Oregon Health Sciences University School Of Medicine, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Verify David Chia-Ont Khan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A65774Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% more Medicare Part D claims than the average radiation oncology physician in 2024
146 Medicare Part D claims for 60 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl31 claims
- Ciprofloxacin Hcl27 claims
- Diazepam19 claims
- Gabapentin17 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 68.8 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).
Industry payments in 2024: $246.32
5 payments; by number, the most common kind was food and beverage; the largest payer was Bayer Healthcare Pharmaceuticals Inc. The 3,275 providers of this specialty with any payment received $1,897.85 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- The Regents OF The University OF CaliforniaLos Angeles, CA
- The Regents OF The University OF CaliforniaSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David Chia-Ont Khan among 735 radiation oncology physician records in California
David Chia-Ont Khan, MD 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. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1994 · median 2005 among the 545 with a school on file
- Record last updated2013 · 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.
All 735 in California → Every provider in El Segundo → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Armand Bouzaglou, M.DDowney, CA 902411457430399
- Christina PhuongCulver City, CA 902321114439684
- Jennie Cho-Lim, M.D.Lawndale, CA 902601235372798
- Lesley Lawrenson, M.D., PH.D.Lawndale, CA 902601457691503
- Clifford Merlo, MDLawndale, CA 902601427198597
- David Rickles, MDLawndale, CA 902601700926862
- Chad Sila, M.D.Lawndale, CA 902601477744811
- Daljit Soni, M.DLynwood, CA 902621467659995
Common questions
What is David Chia-Ont Khan, MD's NPI number?
David Chia-Ont Khan, MD's National Provider Identifier (NPI) is 1649274150, issued on Jun 13, 2005. An NPI identifies a provider in billing; it is not a license.
Where is David Chia-Ont Khan, MD located?
The NPPES record lists a practice address at 860 Parkview Drive North, El Segundo, CA, 90245. Phone: (310) 414-9990. Providers update this record themselves, so call before visiting.
How can I verify David Chia-Ont Khan, MD's license?
NPPES lists California license number A65774, 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.
How much does David Chia-Ont Khan, MD prescribe under Medicare Part D?
In 2024, David Chia-Ont Khan, MD had 146 Medicare Part D claims for 60 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is David Chia-Ont Khan, MD's MIPS final score?
The 2023 MIPS final score is 68.8 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.