Walter S. Chang, MD
Family Medicine Physician · Gardena, CA
Walter S. Chang, MD is a family medicine physician with a practice address in Gardena, California, and NPI 1689044760, issued on Oct 1, 2015. Check the license (California A158199, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Walter S. Chang
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A158199 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15446 S Western Ave, Gardena, CA 90249
- Phone
- (833) 574-2273
- Enumerated
- Oct 1, 2015
- Record last updated
- Feb 20, 2026
- Medicare enrollment
- Enrolled (PECOS I20200716003730); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2017
- 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 15446 S Western Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Andrew AbramPharmacist1821413238
- Christina Chen, DPTPhysical Therapist1649644733
- Peter Chong, MDInternal Medicine Physician1346276789
- Raven Copeland, M.D.Family Medicine Physician1720422470
- Karina CortesClinical Social Worker1376085332
- Joyce George, M.D.Family Medicine Physician1609303999
Verify Walter S. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A158199Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% more Medicare Part D claims than the average family medicine physician in 2024
6,564 Medicare Part D claims for 879 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 105 claims were for opioids.
Most prescribed
- Atorvastatin Calcium634 claims
- Amlodipine Besylate454 claims
- Lisinopril308 claims
- Losartan Potassium232 claims
- Rosuvastatin Calcium184 claims
- Metformin Hcl Er175 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
- Southern California Permanente Medical GroupGardena, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter S. Chang among 17,133 family medicine physician records in California
Walter S. 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 2015, is newer than 74% of them.
- NPI issued2015 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2017 · median 2005 among the 10,652 with a school on file
- Record last updated2026 · 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).
30 family medicine physician records list a practice address in Gardena
They are 30 of the 4,627 NPPES records with a practice address in Gardena, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Gardena → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Uche Chukwudi, M.D.Gardena, CA 902491417192063
- Raven Copeland, M.D.Gardena, CA 902491720422470
- Joyce George, M.D.Gardena, CA 902491609303999
- Hoangvy Le, MDGardena, CA 902491841619095
- Patrick Lemm, D.O.Gardena, CA 902491710920756
- Tu-Anh Nguyen, D.O.Gardena, CA 902491659750487
- Grace Park, D.O. , MPHGardena, CA 902491164677464
- Freyman Recinos, M.D.Gardena, CA 902491194131615
Common questions
What is Walter S. Chang, MD's NPI number?
Walter S. Chang, MD's National Provider Identifier (NPI) is 1689044760, issued on Oct 1, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Walter S. Chang, MD located?
The NPPES record lists a practice address at 15446 S Western Ave, Gardena, CA, 90249. Phone: (833) 574-2273. Providers update this record themselves, so call before visiting.
How can I verify Walter S. Chang, MD's license?
NPPES lists California license number A158199, 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 Walter S. Chang, MD prescribe under Medicare Part D?
In 2024, Walter S. Chang, MD had 6,564 Medicare Part D claims for 879 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.