Chienwei Timothy Chen, MD
Internal Medicine Physician · Irvine, CA
Chienwei Timothy Chen, MD is an internal medicine physician with a practice address in Irvine, California, and NPI 1992795256, issued on Oct 26, 2005. Check the license (California A79035, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Chienwei Timothy Chen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A79035 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4050 Barranca Pkwy, Irvine, CA 92604
- Phone
- (949) 551-1090
- Enumerated
- Oct 26, 2005
- Record last updated
- Oct 13, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (949) 262-5500
- Medicare enrollment
- Enrolled (PECOS I20040826000913); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 1998
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 4050 Barranca Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Barton Billeci, MDAdolescent Medicine (Internal Medicine) Physician1154407237
- Jon Biorkman, MDFamily Medicine Physician1023008679
- Betty Chen, D.D.S., M.S.Orthodontics and Dentofacial Orthopedics Dentistry1902173362
Verify Chienwei Timothy Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A79035Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
69% more Medicare Part D claims than the average internal medicine physician in 2024
5,361 Medicare Part D claims for 514 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 90 claims were for opioids.
Most prescribed
- Atorvastatin Calcium537 claims
- Levothyroxine Sodium227 claims
- Losartan Potassium223 claims
- Amlodipine Besylate221 claims
- Metformin Hcl192 claims
- Lisinopril150 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: $2,004.82
66 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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
- Memorialcare Medical FoundationIrvine, 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
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- 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 Chienwei Timothy Chen, MD's NPI number?
Chienwei Timothy Chen, MD's National Provider Identifier (NPI) is 1992795256, issued on Oct 26, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Chienwei Timothy Chen, MD located?
The NPPES record lists a practice address at 4050 Barranca Pkwy, Irvine, CA, 92604. Phone: (949) 551-1090. Providers update this record themselves, so call before visiting.
How can I verify Chienwei Timothy Chen, MD's license?
NPPES lists California license number A79035, 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 Chienwei Timothy Chen, MD prescribe under Medicare Part D?
In 2024, Chienwei Timothy Chen, MD had 5,361 Medicare Part D claims for 514 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.