Anne An-Ru Chen, M.D.
Internal Medicine Physician · Vacaville, CA
Anne An-Ru Chen, M.D. is an internal medicine physician with a practice address in Vacaville, California, and NPI 1003852708, issued on Jun 21, 2006. Check the license (California A83589, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Anne An-Ru Chen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A83589 CA
Self-reported in NPPES; status is on the state search - Practice location
- 770 Mason St, Vacaville, CA 95688
- Phone
- (707) 427-4900
- Enumerated
- Jun 21, 2006
- Record last updated
- Sep 30, 2025
- Fax
- (707) 454-5911
- Medicare enrollment
- Enrolled (PECOS I20031120001022); accepts Medicare assignment
- Medical or professional school
- Albert Einstein College Of Medicine Of Yeshiva University, 2000
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 770 Mason St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rich Adkins, P.T.Physical Therapist1235141268
- Stephanie Ali, PA-CPhysician Assistant1871964353
- Catherine Anthony-Tkach, FNP-BCFamily Nurse Practitioner1790025922
- Tania Aung, M.D.Allergy Physician1760654263
- Teresa Auyeung, MDFamily Medicine Physician1780771154
- Debashree Banerjee, MDPediatrics Physician1588751952
Verify Anne An-Ru Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A83589Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average internal medicine physician in 2024
7,858 Medicare Part D claims for 418 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. 272 claims were for opioids.
Most prescribed
- Amlodipine Besylate444 claims
- Atorvastatin Calcium443 claims
- Lisinopril300 claims
- Losartan Potassium253 claims
- Metformin Hcl240 claims
- Levothyroxine Sodium221 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.
Bills Medicare through one group practice
- Sutter Valley Medical FoundationFairfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Anne An-Ru Chen among 17,696 internal medicine physician records in California
Anne An-Ru Chen, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2000 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
53 internal medicine physician records list a practice address in Vacaville
They are 53 of the 1,903 NPPES records with a practice address in Vacaville, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Vacaville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kyaw Aung, MDVacaville, CA 956881386722114
- Hon Chan, M.D.Vacaville, CA 956881265529549
- Thomas Fashinell, MDVacaville, CA 956881609926419
- Andleeb Judge, M.D.Vacaville, CA 956881932141124
- Frank Karneges, DOVacaville, CA 956881336220581
- Richard Lasslo, MDVacaville, CA 956881467526780
- James Lee, MDVacaville, CA 956881134279847
- Morris Li, MDVacaville, CA 956881700964442
Common questions
What is Anne An-Ru Chen, M.D.'s NPI number?
Anne An-Ru Chen, M.D.'s National Provider Identifier (NPI) is 1003852708, issued on Jun 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Anne An-Ru Chen, M.D. located?
The NPPES record lists a practice address at 770 Mason St, Vacaville, CA, 95688. Phone: (707) 427-4900. Providers update this record themselves, so call before visiting.
How can I verify Anne An-Ru Chen, M.D.'s license?
NPPES lists California license number A83589, 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 Anne An-Ru Chen, M.D. prescribe under Medicare Part D?
In 2024, Anne An-Ru Chen, M.D. had 7,858 Medicare Part D claims for 418 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.