Eileen Yuan Chang
Emergency Medicine Physician · Torrance, CA
Eileen Yuan Chang is an emergency medicine physician with a practice address in Torrance, California, and NPI 1376746644, issued on Jun 6, 2007. Check the license (California A111171, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Eileen Yuan Chang
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- A111171 CA
224652 MA
Self-reported in NPPES; status is on the state search - Practice location
- 4101 Torrance Blvd, Torrance, CA 90503
- Phone
- (310) 540-7676
- Enumerated
- Jun 6, 2007
- Record last updated
- Aug 6, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100730000897); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 2005
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 4101 Torrance Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Janette Aceituno, AGPCNPNurse Practitioner1366335341
- Caroline Altergott, MDEmergency Medicine Physician1902841901
- Kellie AmanoPharmacist1558070458
- Shama Ambe, M.DNeonatal-Perinatal Medicine Physician1780881763
- Henry Amberg, M.D.Anesthesiology Physician1336167048
- Anne Arafat, PHARM. D.Geriatric Pharmacist1730304452
Verify Eileen Yuan Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A111171Check 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 emergency medicine physician in 2024
546 Medicare Part D claims for 251 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 74 claims were for opioids.
Most prescribed
- Ondansetron Odt129 claims
- Hydrocodone-Acetaminophen65 claims
- Cephalexin53 claims
- Amoxicillin-Clavulanate Potass31 claims
- Ibuprofen30 claims
- Lactulose24 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
- Torrance Emergency Physicians IncTorrance, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eileen Yuan Chang among 7,751 emergency medicine physician records in California
Eileen Yuan Chang is one of 7,751 emergency 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2005 · median 2011 among the 4,560 with a school on file
- Record last updated2015 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
197 emergency medicine physician records list a practice address in Torrance
They are 197 of the 8,901 NPPES records with a practice address in Torrance, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Torrance → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Caroline Altergott, MDTorrance, CA 905031902841901
- Thomas Blush, MDTorrance, CA 905031053343384
- Paul Bryan, MDTorrance, CA 905031396786315
- Frederick Carr, MDTorrance, CA 905031437100211
- Robert Chavez, MDTorrance, CA 905031902829187
- Luke Conovaloff, MDTorrance, CA 905031285690362
- Michelle Finkel, MDTorrance, CA 905031558312330
- Marianne Gausche, MDTorrance, CA 905031487666715
Common questions
What is Eileen Yuan Chang's NPI number?
Eileen Yuan Chang's National Provider Identifier (NPI) is 1376746644, issued on Jun 6, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Eileen Yuan Chang located?
The NPPES record lists a practice address at 4101 Torrance Blvd, Torrance, CA, 90503. Phone: (310) 540-7676. Providers update this record themselves, so call before visiting.
How can I verify Eileen Yuan Chang's license?
NPPES lists California license number A111171, 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 Eileen Yuan Chang prescribe under Medicare Part D?
In 2024, Eileen Yuan Chang had 546 Medicare Part D claims for 251 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.