William Shelton Chen, MD
Radiation Oncology Physician · San Francisco, CA
William Shelton Chen, MD is a radiation oncology physician with a practice address in San Francisco, California, and NPI 1316566367, issued on Apr 9, 2020. Check the license (California A183321, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Shelton Chen
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A183321 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2425 Geary Blvd, San Francisco, CA 94115
- Phone
- (415) 833-2000
- Enumerated
- Apr 9, 2020
- Record last updated
- Jun 12, 2025
- Medicare enrollment
- Enrolled (PECOS I20250625003419); accepts Medicare assignment
- Medical or professional school
- Yale University School Of Medicine, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 2425 Geary Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Laura Abbott, M.D.Student in an Organized Health Care Education/Training Program1093071367
- Brian Ablang, P.T.Physical Therapist1609931054
- Arash AgharahmanianStudent in an Organized Health Care Education/Training Program1366237240
- Mia AldridgeStudent in an Organized Health Care Education/Training Program1437890761
- Catherine Grace Alejo, NPFamily Nurse Practitioner1932273521
Verify William Shelton Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A183321Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average radiation oncology physician in 2024
16 Medicare Part D claims for 11 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Industry payments in 2024: $156.00
1 payment: food and beverage; the largest payer was RefleXion Medical, 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
- Ucsf Medical Group Business ServicesBurlingame, 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 Shelton Chen among 735 radiation oncology physician records in California
William Shelton 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 2020, is newer than 95% of them.
- NPI issued2020 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2020 · median 2005 among the 545 with a school on file
- Record last updated2025 · 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
- Roy Abendroth, MDSan Francisco, CA 941151811988421
- Jason Chan, M.D.San Francisco, CA 941151033536917
- Barry Chauser, MDSan Francisco, CA 941151902897515
- Nam Woo Cho, MDPHDSan Francisco, CA 941151811420052
- Alexander Gottschalk, M.D.San Francisco, CA 941151790728137
- I-Chow Hsu, M.D.San Francisco, CA 941151144263039
- Sara Huang, MDSan Francisco, CA 941151053393033
- John Lee, MDSan Francisco, CA 941151316938657
Common questions
What is William Shelton Chen, MD's NPI number?
William Shelton Chen, MD's National Provider Identifier (NPI) is 1316566367, issued on Apr 9, 2020. An NPI identifies a provider in billing; it is not a license.
Where is William Shelton Chen, MD located?
The NPPES record lists a practice address at 2425 Geary Blvd, San Francisco, CA, 94115. Phone: (415) 833-2000. Providers update this record themselves, so call before visiting.
How can I verify William Shelton Chen, MD's license?
NPPES lists California license number A183321, 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 Shelton Chen, MD prescribe under Medicare Part D?
In 2024, William Shelton Chen, MD had 16 Medicare Part D claims for 11 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
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.