Jian A. Chen, M.D.
Internal Medicine Physician · Santa Paula, CA
Jian A. Chen, M.D. is an internal medicine physician with a practice address in Santa Paula, California, and NPI 1679568612, issued on Sep 15, 2005. Check the license (California G77775, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jian A. Chen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G77775 CA
Self-reported in NPPES; status is on the state search - Practice location
- 243 March St, Santa Paula, CA 93060
- Phone
- (805) 525-7131
- Enumerated
- Sep 15, 2005
- Record last updated
- Oct 3, 2023
- Medicare enrollment
- Enrolled (PECOS I20100203000519); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1992
- 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 243 March St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Dekkers, M.D.Internal Medicine Physician1821083171
- Gary Deutsch, M.D.Internal Medicine Physician1932194289
Verify Jian A. Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G77775Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average internal medicine physician in 2024
7,541 Medicare Part D claims for 451 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 240 claims were for opioids.
Most prescribed
- Atorvastatin Calcium518 claims
- Levothyroxine Sodium453 claims
- Amlodipine Besylate284 claims
- Metformin Hcl185 claims
- Omeprazole163 claims
- Gabapentin157 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.
The MIPS final score for 2023 (Medicare payment program): 96.5 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $579.46
23 payments; by number, the most common kind was food and beverage; the largest payer was Amgen 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
- Dignity Health Medical FoundationSanta Paula, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jian A. Chen among 17,696 internal medicine physician records in California
Jian A. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1992 · median 2004 among the 11,065 with a school on file
- Record last updated2023 · 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).
10 internal medicine physician records list a practice address in Santa Paula
They are 10 of the 366 NPPES records with a practice address in Santa Paula, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Santa Paula → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michelle Azimov, M.D.Santa Paula, CA 930601831293273
- Cynthia Caffrey, MDSanta Paula, CA 930601922156991
- Carl Constantine, M.D.Santa Paula, CA 930601669586293
- Robert Dekkers, M.D.Santa Paula, CA 930601821083171
- Gary Deutsch, M.D.Santa Paula, CA 930601932194289
- Orlanda Ferreira, MDSanta Paula, CA 930601295199693
- Oluwatumininu Johnson, MDSanta Paula, CA 930601881882256
- Christian Lami, M.D.Santa Paula, CA 930601598144974
Common questions
What is Jian A. Chen, M.D.'s NPI number?
Jian A. Chen, M.D.'s National Provider Identifier (NPI) is 1679568612, issued on Sep 15, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Jian A. Chen, M.D. located?
The NPPES record lists a practice address at 243 March St, Santa Paula, CA, 93060. Phone: (805) 525-7131. Providers update this record themselves, so call before visiting.
How can I verify Jian A. Chen, M.D.'s license?
NPPES lists California license number G77775, 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 Jian A. Chen, M.D. prescribe under Medicare Part D?
In 2024, Jian A. Chen, M.D. had 7,541 Medicare Part D claims for 451 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Jian A. Chen, M.D.'s MIPS final score?
The 2023 MIPS final score is 96.5 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.