John S. Leung, MD
Emergency Medicine Physician · Monterey Park, CA
John S. Leung, MD is an emergency medicine physician with a practice address in Monterey Park, California, and NPI 1649214198, issued on Jun 15, 2006. Check the license (California A81012, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John S. Leung
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A81012 CA
Self-reported in NPPES; status is on the state search - Practice location
- 525 N Garfield Avenue, Monterey Park, CA 91754
- Phone
- (626) 307-2129
- Enumerated
- Jun 15, 2006
- Record last updated
- Nov 5, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (626) 307-2056
- Medicaid ID
- 00A810120 CA
- Medicare enrollment
- Enrolled (PECOS I20031226000117); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 1997
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Verify John S. Leung in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A81012Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% fewer Medicare Part D claims than the average emergency medicine physician in 2024
182 Medicare Part D claims for 137 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 36 claims were for opioids.
Most prescribed
- Cephalexin27 claims
- Ondansetron Odt23 claims
- Tramadol Hcl22 claims
- Hydrocodone-Acetaminophen14 claims
- Azithromycin11 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): 91.4 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).
Industry payments in 2024: $17.54
1 payment: food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 12,335 providers of this specialty with any payment received $953.79 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 2 group practices
- Burbank Emergency Medical Group IncBurbank, CA
- Smartclinic IncSanta Clarita, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John S. Leung among 7,751 emergency medicine physician records in California
John S. Leung, MD 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 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1997 · median 2011 among the 4,560 with a school on file
- Record last updated2017 · 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).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Monterey Park → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Connie Chan, D.O.Monterey Park, CA 917541639105745
- Li CuiMonterey Park, CA 917541093193575
- Dolores De Cruz, M.D.Monterey Park, CA 917541265469696
- Kimberly IwakiMonterey Park, CA 917541427476266
- Juan Jones, M.D.Monterey Park, CA 917541194964387
- Phong Ngo, MDMonterey Park, CA 917541942243449
- Jeremy Williams, M.D.Monterey Park, CA 917541023052230
- Sharon Dabby, MDOntario, CA 917611609953124
Common questions
What is John S. Leung, MD's NPI number?
John S. Leung, MD's National Provider Identifier (NPI) is 1649214198, issued on Jun 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John S. Leung, MD located?
The NPPES record lists a practice address at 525 N Garfield Avenue, Monterey Park, CA, 91754. Phone: (626) 307-2129. Providers update this record themselves, so call before visiting.
How can I verify John S. Leung, MD's license?
NPPES lists California license number A81012, 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 John S. Leung, MD prescribe under Medicare Part D?
In 2024, John S. Leung, MD had 182 Medicare Part D claims for 137 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is John S. Leung, MD's MIPS final score?
The 2023 MIPS final score is 91.4 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.