Rachel Si-Wen Chang, MD
Internal Medicine Physician · Los Angeles, CA
Rachel Si-Wen Chang, MD is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1891435939, issued on Mar 29, 2022. Check the license (California A187604, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Rachel Si-Wen Chang
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A187604 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1450 San Pablo St Ste 3000, Los Angeles, CA 90033
- Phone
- (323) 442-8415
- Enumerated
- Mar 29, 2022
- Record last updated
- Sep 30, 2025
- Medicare enrollment
- Enrolled (PECOS I20250924003708); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 2022
- 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 1450 San Pablo St Ste 3000
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Rachel Si-Wen Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A187604Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Usc Care Medical Group IncLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rachel Si-Wen Chang among 17,696 internal medicine physician records in California
Rachel Si-Wen Chang, MD 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 2022, is newer than 95% of them.
- NPI issued2022 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2022 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 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).
1,423 internal medicine physician records list a practice address in Los Angeles
They are 1,423 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Angeles → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ron Ben-Ari, M.D.Los Angeles, CA 900331275562431
- John Brodhead, M.D.Los Angeles, CA 900331760424824
- Bharat Chaudry, M.D.Los Angeles, CA 900331194754374
- William Hardy, M.D.Los Angeles, CA 900331760410518
- Howard Hodis, M.D.Los Angeles, CA 900331407894009
- Eric Hsieh, M.D.Los Angeles, CA 900331811941974
- Jenny Hwang, M.D.Los Angeles, CA 900331578548764
- Michael Karp, M.D.Los Angeles, CA 900331336177229
Common questions
What is Rachel Si-Wen Chang, MD's NPI number?
Rachel Si-Wen Chang, MD's National Provider Identifier (NPI) is 1891435939, issued on Mar 29, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Rachel Si-Wen Chang, MD located?
The NPPES record lists a practice address at 1450 San Pablo St Ste 3000, Los Angeles, CA, 90033. Phone: (323) 442-8415. Providers update this record themselves, so call before visiting.
How can I verify Rachel Si-Wen Chang, MD's license?
NPPES lists California license number A187604, 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.
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.