Ruey Jen Chang, P.A.
Medical Physician Assistant · La Palma, CA
Ruey Jen Chang, P.A. is a medical physician assistant with a practice address in La Palma, California, and NPI 1699064006, issued on Apr 6, 2011. Check the license (California PA20204, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Ruey Jen Chang
- Credential
- P.A.
- Primary taxonomy
- Medical Physician Assistant 363AM0700X
- License number
- PA20204 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5451 LA Palma Ave, La Palma, CA 90623
- Phone
- (714) 670-1340
- Enumerated
- Apr 6, 2011
- Record last updated
- Apr 7, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (714) 443-3780
- Medicare enrollment
- Enrolled (PECOS I20110602000103); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical physician assistant records → All 3,376 in California → Look up another NPI →
Also registered at 5451 LA Palma Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Behrooz Ahmadi, M.DSpecialist1437248820
- Martin Garcia, M.D.Otolaryngology Physician1356344170
- Terrisa HaFamily Medicine Physician1083675516
- Gerald Ho, M.D.Rheumatology Physician1205833662
- Sarah Hwang, M.D.Rheumatology Physician1588682926
- Sandy Lee, DORheumatology Physician1013404912
Verify Ruey Jen Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license PA20204Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average medical physician assistant in 2024
156 Medicare Part D claims for 61 beneficiaries, against an average of 1,148 among the 23,801 providers of this specialty who prescribed in Part D. 49 claims were for opioids.
Most prescribed
- Pregabalin44 claims
- Tramadol Hcl43 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 practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,964.12
98 payments; by number, the most common kind was food and beverage; the largest payer was Ucb, Inc. The 16,165 providers of this specialty with any payment received $1,055.00 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
- Arthritis And Osteoporosis Medical Center, IncMonterey Park, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ruey Jen Chang among 3,376 medical physician assistant records in California
Ruey Jen Chang, P.A. is one of 3,376 medical physician assistant records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 46% of them.
- NPI issued2011 · 46% of these records are older, 49% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 40% of these records are
- Graduated2008 · median 2012 among the 1,347 with a school on file
- Record last updated2011 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AM0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
4 medical physician assistant records list a practice address in La Palma
They are 4 of the 593 NPPES records with a practice address in La Palma, and 3,376 medical physician assistant records in California.
All 3,376 in California → Every provider in La Palma → Medical Physician Assistant nationwide →
The 8 medical physician assistant records with the nearest ZIP codes
- Caleb KilLa Palma, CA 906231699319848
- Lawrence Tsai, PA-CLa Palma, CA 906231316247661
- Juliana Wilson, PA-CLa Palma, CA 906231851587919
- Min Joo Kim, PA-C, MPHBuena Park, CA 906211811543143
- Sokan Hunro, PABuena Park, CA 906201518014398
- Danielle Wells, PA-CCypress, CA 906301750466181
- Ronald Baumgartner, P.A.La Habra, CA 906311104835404
- Delia Ramirez, PALa Habra, CA 906311841503752
Common questions
What is Ruey Jen Chang, P.A.'s NPI number?
Ruey Jen Chang, P.A.'s National Provider Identifier (NPI) is 1699064006, issued on Apr 6, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Ruey Jen Chang, P.A. located?
The NPPES record lists a practice address at 5451 LA Palma Ave, La Palma, CA, 90623. Phone: (714) 670-1340. Providers update this record themselves, so call before visiting.
How can I verify Ruey Jen Chang, P.A.'s license?
NPPES lists California license number PA20204, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Ruey Jen Chang, P.A. prescribe under Medicare Part D?
In 2024, Ruey Jen Chang, P.A. had 156 Medicare Part D claims for 61 beneficiaries; the average among medical physician assistant prescribers was 1,148. Part D covers Medicare prescriptions only.
What is Ruey Jen Chang, P.A.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. 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.