William Cheng Chen, MD
Radiation Oncology Physician · San Francisco, CA
William Cheng Chen, MD is a radiation oncology physician with a practice address in San Francisco, California, and NPI 1417452251, issued on Mar 26, 2018. Check the license (California A166045, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Cheng Chen
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A166045 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1600 Divisadero St Ste H-1031, San Francisco, CA 94143
- Phone
- (415) 353-7175
- Enumerated
- Mar 26, 2018
- Record last updated
- Jun 13, 2023
- Medicare enrollment
- Enrolled (PECOS I20230726003409); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2018
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Verify William Cheng Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A166045Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
63% fewer Medicare Part D claims than the average radiation oncology physician in 2024
50 Medicare Part D claims for 34 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Ondansetron Hcl13 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): 74.5 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
- Ucsf Medical Group Business ServicesBerkeley, CA
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Cheng Chen among 735 radiation oncology physician records in California
William Cheng Chen, 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 2018, is newer than 89% of them.
- NPI issued2018 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2018 · median 2005 among the 545 with a school on file
- Record last updated2023 · 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 Francisco → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Lauren Boreta, M.D.San Francisco, CA 941431679990071
- Steve Braunstein, MD, PHDSan Francisco, CA 941431760610141
- Mary Feng, M.D.San Francisco, CA 941431720106693
- Barbara Fowble, M.D.San Francisco, CA 941431881623866
- Encouse Golden, MD, PHDSan Francisco, CA 941431841525664
- Kavita Mishra, M.D., M.P.H.San Francisco, CA 941431568640076
- Jean Nakamura, M.D.San Francisco, CA 941431154369551
- Anna Paulsson, M.D.San Francisco, CA 941431134562333
Common questions
What is William Cheng Chen, MD's NPI number?
William Cheng Chen, MD's National Provider Identifier (NPI) is 1417452251, issued on Mar 26, 2018. An NPI identifies a provider in billing; it is not a license.
Where is William Cheng Chen, MD located?
The NPPES record lists a practice address at 1600 Divisadero St Ste H-1031, San Francisco, CA, 94143. Phone: (415) 353-7175. Providers update this record themselves, so call before visiting.
How can I verify William Cheng Chen, MD's license?
NPPES lists California license number A166045, 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 William Cheng Chen, MD prescribe under Medicare Part D?
In 2024, William Cheng Chen, MD had 50 Medicare Part D claims for 34 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is William Cheng Chen, MD's MIPS final score?
The 2023 MIPS final score is 74.5 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.