Clara Y. Choi, M.D., PH.D.
Radiation Oncology Physician · San Mateo, CA
Clara Y. Choi, M.D., PH.D. is a radiation oncology physician with a practice address in San Mateo, California, and NPI 1225236649, issued on Jul 6, 2007. Check the license (California A84039, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Clara Y. Choi
- Credential
- M.D., PH.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A84039 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3020 Monterey St, San Mateo, CA 94403
- Phone
- (650) 212-7387
- Enumerated
- Jul 6, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20071017000671); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 2002
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Verify Clara Y. Choi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A84039Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
30% fewer Medicare Part D claims than the average radiation oncology physician in 2024
94 Medicare Part D claims for 28 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Pilocarpine Hcl25 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): 80.6 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: $23.75
1 payment: food and beverage; the largest payer was E.R. Squibb & Sons, L.L.C. 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 one group practice
- County OF Santa ClaraSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clara Y. Choi among 735 radiation oncology physician records in California
Clara Y. Choi, M.D., PH.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
- Graduated2002 · 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 San Mateo → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Dhara Macdermed, MDSan Mateo, CA 944011366616807
- Al Taira, MDSan Mateo, CA 944011346322567
- Stanley Chism, M.DPalo Alto, CA 943061154557536
- Sammy Ashouri, M.D.Stanford, CA 943051871906396
- Michael Binkley, M.D.Stanford, CA 943051760844856
- Santino Butler, MDStanford, CA 943051588291447
- Clement Ho, MDStanford, CA 943051790195188
- Noah Kastelowitz-Lieberman, MDStanford, CA 943051184119653
Common questions
What is Clara Y. Choi, M.D., PH.D.'s NPI number?
Clara Y. Choi, M.D., PH.D.'s National Provider Identifier (NPI) is 1225236649, issued on Jul 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Clara Y. Choi, M.D., PH.D. located?
The NPPES record lists a practice address at 3020 Monterey St, San Mateo, CA, 94403. Phone: (650) 212-7387. Providers update this record themselves, so call before visiting.
How can I verify Clara Y. Choi, M.D., PH.D.'s license?
NPPES lists California license number A84039, 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 Clara Y. Choi, M.D., PH.D. prescribe under Medicare Part D?
In 2024, Clara Y. Choi, M.D., PH.D. had 94 Medicare Part D claims for 28 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Clara Y. Choi, M.D., PH.D.'s MIPS final score?
The 2023 MIPS final score is 80.6 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.