Roy Vongtama, M.D.
Radiation Oncology Physician · Los Angeles, CA
Roy Vongtama, M.D. is a radiation oncology physician with a practice address in Los Angeles, California, and NPI 1083837058, issued on Apr 10, 2007. Check the license (California A78334, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Roy Vongtama
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A78334 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 Medical Plaza, Los Angeles, CA 90095
- Phone
- (310) 825-0128
- Enumerated
- Apr 10, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (310) 794-9795
- Medicare enrollment
- Enrolled (PECOS I20070511000244); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 200 Medical Plaza
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anita Agzarian, MDInternal Medicine Physician1144254590
- Sheila Ahmadi, MDEndocrinology, Diabetes & Metabolism Physician1194800094
- Marine Altunyan, PHARMDAmbulatory Care Pharmacist1578300083
- Gayane Ambartsumyan, MDObstetrics & Gynecology Physician1174556849
- Parviz Amid, M.D.Surgery Physician1073633459
- Adrienne Bawa, REGISTERED NURSECase Management Registered Nurse1497355366
Verify Roy Vongtama in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A78334Check 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): 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).
Bills Medicare through 2 group practices
- The Regents OF The University OF CaliforniaLos Angeles, CA
- Ucla Radiology Medical GroupLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Roy Vongtama among 735 radiation oncology physician records in California
Roy Vongtama, 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. Its NPI, issued in 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 43% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2000 · median 2005 among the 545 with a school on file
- Record last updated2007 · 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 Los Angeles → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Phillip Beron, MDLos Angeles, CA 900951083698237
- David Demanes, M.D.Los Angeles, CA 900951407914757
- Paul Duong, M.D.Los Angeles, CA 900951790750768
- Hany Elsaleh, MDLos Angeles, CA 900951639104623
- Judith Ford, MDLos Angeles, CA 900951982638565
- Sara Kim, M.D.Los Angeles, CA 900951851405278
- Christopher King, M.D.Los Angeles, CA 900951962574145
- Patrick Kupelian, MDLos Angeles, CA 900951144205881
Common questions
What is Roy Vongtama, M.D.'s NPI number?
Roy Vongtama, M.D.'s National Provider Identifier (NPI) is 1083837058, issued on Apr 10, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Roy Vongtama, M.D. located?
The NPPES record lists a practice address at 200 Medical Plaza, Los Angeles, CA, 90095. Phone: (310) 825-0128. Providers update this record themselves, so call before visiting.
How can I verify Roy Vongtama, M.D.'s license?
NPPES lists California license number A78334, 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 Roy Vongtama, M.D.'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.