Justin Alexander Chen, MD
Nephrology Physician · Pasadena, CA
Justin Alexander Chen, MD is a nephrology physician with a practice address in Pasadena, California, and NPI 1447526066, issued on Mar 28, 2012. Check the license (California 127264, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Justin Alexander Chen
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 127264 CA
Self-reported in NPPES; status is on the state search - Practice location
- 301 S Fair Oaks Ave Ste 405, Pasadena, CA 91105
- Phone
- (626) 352-0010
- Enumerated
- Mar 28, 2012
- Record last updated
- Jan 29, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (626) 226-3520
- Medicare enrollment
- Enrolled (PECOS I20170927004570); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 301 S Fair Oaks Ave Ste 405
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dolores Figueroa, M.D.Internal Medicine Physician1033287701
- Jennifer Kahau-Segovia, FNPNurse Practitioner1629608906
- Ilian Marquez, M.D.Nephrology Physician1710019906
- Nalini Mattai, MDGeneral Practice Physician1982803052
- Elana Sheldon, MDInternal Medicine Physician1790708915
- Ashok Sunder Raj, M.D.Nephrology Physician1093744070
Verify Justin Alexander Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 127264Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average nephrology physician in 2024
912 Medicare Part D claims for 167 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.
Most prescribed
- Losartan Potassium82 claims
- Amlodipine Besylate69 claims
- Carvedilol50 claims
- Prosol50 claims
- Furosemide49 claims
- Allopurinol36 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): 44.2 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).
Bills Medicare through one group practice
- Sevag Balikian, M.D., A Professional CorporationPasadena, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Justin Alexander Chen among 1,468 nephrology physician records in California
Justin Alexander Chen, MD is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 80% of them.
- NPI issued2012 · 80% of these records are older, 17% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2012 · median 2001 among the 1,128 with a school on file
- Record last updated2018 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Pasadena → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Syeda Ali, MDPasadena, CA 911051528051984
- Allen ChaoPasadena, CA 911051952765034
- Muhammad Iqbal, M.D.Pasadena, CA 911051578515896
- Matthew Kim, DOPasadena, CA 911051700319837
- Michael Linsey, M.D.Pasadena, CA 911051841215217
- Ilian Marquez, M.D.Pasadena, CA 911051710019906
- Ann Moore, MDPasadena, CA 911051750506630
- Ashok Sunder Raj, M.D.Pasadena, CA 911051093744070
Common questions
What is Justin Alexander Chen, MD's NPI number?
Justin Alexander Chen, MD's National Provider Identifier (NPI) is 1447526066, issued on Mar 28, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Justin Alexander Chen, MD located?
The NPPES record lists a practice address at 301 S Fair Oaks Ave Ste 405, Pasadena, CA, 91105. Phone: (626) 352-0010. Providers update this record themselves, so call before visiting.
How can I verify Justin Alexander Chen, MD's license?
NPPES lists California license number 127264, 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 Justin Alexander Chen, MD prescribe under Medicare Part D?
In 2024, Justin Alexander Chen, MD had 912 Medicare Part D claims for 167 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.
What is Justin Alexander Chen, MD's MIPS final score?
The 2023 MIPS final score is 44.2 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.