Weyjuin Eric Chao, M.D.
Emergency Medicine Physician · South El Monte, CA
Weyjuin Eric Chao, M.D. is an emergency medicine physician with a practice address in South El Monte, California, and NPI 1154852218, issued on Mar 21, 2017. Check the license (California A172222, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Weyjuin Eric Chao
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A172222 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1701 Santa Anita Ave, South El Monte, CA 91733
- Phone
- (626) 579-7777
- Enumerated
- Mar 21, 2017
- Record last updated
- Jul 6, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210713003181); accepts Medicare assignment
- Medical or professional school
- New York University School Of Medicine, 2017
- Entity
- Type 1 · individual
Also registered at 1701 Santa Anita Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Assibi Abudu, M.D.Emergency Medicine Physician1376585042
- Sunanda Chatterjee, MDAnatomic Pathology & Clinical Pathology Physician1265491641
- Usha Gupta, MDAnesthesiology Physician1134151251
- John Lin, M.D.Internal Medicine Physician1689602609
- Anh Mai, M.D.Emergency Medicine Physician1376706853
- Ma Myint, M.D.Anesthesiology Physician1942264585
Verify Weyjuin Eric Chao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A172222Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
27% more Medicare Part D claims than the average emergency medicine physician in 2024
288 Medicare Part D claims for 205 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims. 31 claims were for opioids.
Most prescribed
- Ibuprofen32 claims
- Cephalexin26 claims
- Ondansetron Odt22 claims
- Hydrocodone-Acetaminophen20 claims
- Amoxicillin-Clavulanate Potass15 claims
- Prednisone15 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 practice group's MIPS final score for 2023 (Medicare payment program): 85.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Faculty Physicians And Surgeons OF LlusmLoma Linda, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
3 emergency medicine physician records list a practice address in South El Monte
They are 3 of the 106 NPPES records with a practice address in South El Monte, and 7,751 emergency medicine physician records in California.
All 3 in South El Monte → All 7,751 in California → Every provider in South El Monte →
Other emergency medicine physician records in California
- Cooper Aakhus, MDStanford, CA1194351007
- Pyra Aarden, MDMartinez, CA1417058199
- Neal Aaron, D.O.Encinitas, CA1114283520
- Eric AaserudeWalnut Creek, CA1811491194
- Nader Abas, MDBarstow, CA1346288305
- Michael Abbo, MDNovato, CA1205819042
- Daniel Abbott, MDFullerton, CA1518907864
- Paul-Andre Abboud, M.D.Oakland, CA1710065503
- Mostafa Abdel-Hamid, MDStanford, CA1457918740
- Ashraf Abdel-KerimChino, CA1396961538
Common questions
What is Weyjuin Eric Chao, M.D.'s NPI number?
Weyjuin Eric Chao, M.D.'s National Provider Identifier (NPI) is 1154852218, issued on Mar 21, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Weyjuin Eric Chao, M.D. located?
The NPPES record lists a practice address at 1701 Santa Anita Ave, South El Monte, CA, 91733. Phone: (626) 579-7777. Providers update this record themselves, so call before visiting.
How can I verify Weyjuin Eric Chao, M.D.'s license?
NPPES lists California license number A172222, 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 Weyjuin Eric Chao, M.D. prescribe under Medicare Part D?
In 2024, Weyjuin Eric Chao, M.D. had 288 Medicare Part D claims for 205 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Weyjuin Eric Chao, M.D.'s MIPS final score?
The 2023 MIPS final score is 85.2 of 100, reported for the practice group. 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.