William Chen, M.D.
Internal Medicine Physician · Irvine, CA
William Chen, M.D. is an internal medicine physician with a practice address in Irvine, California, and NPI 1881659142, issued on Apr 19, 2006. Check the license (California A93575, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Chen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A93575 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6650 Alton Pkwy, Irvine, CA 92618
- Phone
- (949) 932-2514
- Enumerated
- Apr 19, 2006
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070712000839); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 2000
- Entity
- Type 1 · individual
Also registered at 6650 Alton Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dayle Aldridge, RN, CDE, MPHDiabetes Educator Registered Nurse1619400223
- Tiffany ChavesRegistered Dietitian1194169177
- Raymond Cho, PHARMDPharmacist1992272306
- Travis Cohoon, MDCardiovascular Disease Physician1205363264
- Jasmine CrouzetPharmacist1770122665
- Shireena Desai, M.D.Gastroenterology Physician1144457995
Verify William Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A93575Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,043 Medicare Part D claims for 358 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Furosemide240 claims
- Losartan Potassium193 claims
- Lisinopril142 claims
- Amlodipine Besylate119 claims
- Atorvastatin Calcium81 claims
- Allopurinol77 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: $102.26
1 payment: food and beverage; the largest payer was Gilead Sciences, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Southern California Permanente Medical GroupAnaheim, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
155 internal medicine physician records list a practice address in Irvine
They are 155 of the 7,778 NPPES records with a practice address in Irvine, and 17,696 internal medicine physician records in California.
All 155 in Irvine → All 17,696 in California → Every provider in Irvine →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is William Chen, M.D.'s NPI number?
William Chen, M.D.'s National Provider Identifier (NPI) is 1881659142, issued on Apr 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Chen, M.D. located?
The NPPES record lists a practice address at 6650 Alton Pkwy, Irvine, CA, 92618. Phone: (949) 932-2514. Providers update this record themselves, so call before visiting.
How can I verify William Chen, M.D.'s license?
NPPES lists California license number A93575, 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 Chen, M.D. prescribe under Medicare Part D?
In 2024, William Chen, M.D. had 2,043 Medicare Part D claims for 358 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.