Rex Der Chang, MD
Family Medicine Physician · El Segundo, CA
Rex Der Chang, MD is a family medicine physician with a practice address in El Segundo, California, and NPI 1174143622, issued on Apr 24, 2020. Check the license (California A193710, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Rex Der Chang
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A193710 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2110 E EL Segundo Blvd, El Segundo, CA 90245
- Phone
- (310) 517-7010
- Enumerated
- Apr 24, 2020
- Record last updated
- Dec 18, 2025
- Medicare enrollment
- Enrolled (PECOS I20240702002704); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 2110 E EL Segundo Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Melody CastellonMedical Physician Assistant1033698717
Verify Rex Der Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A193710Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average family medicine physician in 2024
880 Medicare Part D claims for 175 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium61 claims
- Omeprazole49 claims
- Lisinopril42 claims
- Meloxicam35 claims
- Duloxetine Hcl28 claims
- Baclofen27 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: $229.04
11 payments; by number, the most common kind was food and beverage; the largest payer was Ucb, Inc. The 55,478 providers of this specialty with any payment received $902.55 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
- Torrance Health Association IncTorrance, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rex Der Chang among 17,133 family medicine physician records in California
Rex Der Chang, MD is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 88% of them.
- NPI issued2020 · 88% of these records are older, 9% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2018 · median 2005 among the 10,652 with a school on file
- Record last updated2025 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 family medicine physician records list a practice address in El Segundo
They are 19 of the 5,178 NPPES records with a practice address in El Segundo, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in El Segundo → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Michael Anne Browne, M.D.El Segundo, CA 902451124363494
- Arnold Chanin, MDEl Segundo, CA 902451750471801
- Trevor Hayes, D.O.El Segundo, CA 902451568672673
- Krithika Kavanoor, M.D.El Segundo, CA 902451477996999
- Viki LinEl Segundo, CA 902451023003670
- Christopher Lindshield, M.D.El Segundo, CA 902451679649263
- Renee Macleod, D.O.El Segundo, CA 902451548294374
- Peter Mikhail, D.O.El Segundo, CA 902451861506941
Common questions
What is Rex Der Chang, MD's NPI number?
Rex Der Chang, MD's National Provider Identifier (NPI) is 1174143622, issued on Apr 24, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Rex Der Chang, MD located?
The NPPES record lists a practice address at 2110 E EL Segundo Blvd, El Segundo, CA, 90245. Phone: (310) 517-7010. Providers update this record themselves, so call before visiting.
How can I verify Rex Der Chang, MD's license?
NPPES lists California license number A193710, 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 Rex Der Chang, MD prescribe under Medicare Part D?
In 2024, Rex Der Chang, MD had 880 Medicare Part D claims for 175 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.