William Yawei Chen, DO
Family Medicine Physician · Ventura, CA
William Yawei Chen, DO is a family medicine physician with a practice address in Ventura, California, and NPI 1538654355, issued on Jun 25, 2018. Check the license (California 20A17875, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Yawei Chen
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A17875 CA
Self-reported in NPPES; status is on the state search - Practice location
- 147 N Brent St, Ventura, CA 93003
- Phone
- (805) 652-5672
- Enumerated
- Jun 25, 2018
- Record last updated
- May 23, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20220315002211); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 147 N Brent St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Yawei Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A17875Check 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 family medicine physician in 2024
420 Medicare Part D claims for 46 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Amlodipine Besylate36 claims
- Atorvastatin Calcium33 claims
- Losartan Potassium30 claims
- Metformin Hcl30 claims
- Jardiance23 claims
- Lisinopril21 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: $119.85
1 payment: food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. The 55,478 providers of this specialty with any payment received $902.55 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 Los AngelesLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Yawei Chen among 17,133 family medicine physician records in California
William Yawei Chen, DO is one of 17,133 family medicine physician records with a practice address in California. 81% 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 82% of them.
- NPI issued2018 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2018 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
234 family medicine physician records list a practice address in Ventura
They are 234 of the 4,435 NPPES records with a practice address in Ventura, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Ventura → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Charles Adams, M.D.Ventura, CA 930031811925225
- Veronica Butler, M.D.Ventura, CA 930031063472736
- Eric Chun, M.D.Ventura, CA 930031699702381
- Michelle Daucett, D.O.Ventura, CA 930031003873035
- Derrick Dcosta, M.D.Ventura, CA 930031487699005
- James Hermann, M.D.Ventura, CA 930031861442899
- Theodore Hole, M.D.Ventura, CA 930031104873611
- Andrew Kerr, M.D.Ventura, CA 930031487695078
Common questions
What is William Yawei Chen, DO's NPI number?
William Yawei Chen, DO's National Provider Identifier (NPI) is 1538654355, issued on Jun 25, 2018. An NPI identifies a provider in billing; it is not a license.
Where is William Yawei Chen, DO located?
The NPPES record lists a practice address at 147 N Brent St, Ventura, CA, 93003. Phone: (805) 652-5672. Providers update this record themselves, so call before visiting.
How can I verify William Yawei Chen, DO's license?
NPPES lists California license number 20A17875, 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 Yawei Chen, DO prescribe under Medicare Part D?
In 2024, William Yawei Chen, DO had 420 Medicare Part D claims for 46 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.