Markus T. Leong, MD
Emergency Medicine Physician · South San Francisco, CA
Markus T. Leong, MD is an emergency medicine physician with a practice address in South San Francisco, California, and NPI 1427136050, issued on Nov 1, 2006. Check the license (California A81198, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Markus T. Leong
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A81198 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 EL Camino Real, South San Francisco, CA 94080
- Phone
- (650) 742-2000
- Enumerated
- Nov 1, 2006
- Record last updated
- Feb 14, 2022
- Medicaid ID
- 00A811980 CA
- Medicare enrollment
- Enrolled (PECOS I20031204001239); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 2000
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1200 EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Karl Anderson, MDUrology Physician1700964301
Verify Markus T. Leong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A81198Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average emergency medicine physician in 2024
196 Medicare Part D claims for 148 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Cephalexin54 claims
- Prednisone17 claims
- Amoxicillin-Clavulanate Potass16 claims
- Hydrocodone-Acetaminophen14 claims
- Ibuprofen13 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): 94.6 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 2 group practices
- Cep America - CaliforniaSan Francisco, CA
- San Francisco Emergency Medical AssociatesLakeport, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Markus T. Leong among 7,751 emergency medicine physician records in California
Markus T. Leong, 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
- Graduated2000 · median 2011 among the 4,560 with a school on file
- Record last updated2022 · 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).
23 emergency medicine physician records list a practice address in South San Francisco
They are 23 of the 1,173 NPPES records with a practice address in South San Francisco, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in South San Francisco → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Edward Baddour, MDSouth San Francisco, CA 940801013095645
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- Eric Chin, MDSouth San Francisco, CA 940801750469383
- Jeffrey Crowder, MDSouth San Francisco, CA 940801710065313
- Eric Dilda, MDSouth San Francisco, CA 940801386722999
- Elijah Edwards, MDSouth San Francisco, CA 940801538374160
- Jason Eiband, MDSouth San Francisco, CA 940801114005717
- Kim Feigon, MDSouth San Francisco, CA 940801609954254
Common questions
What is Markus T. Leong, MD's NPI number?
Markus T. Leong, MD's National Provider Identifier (NPI) is 1427136050, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Markus T. Leong, MD located?
The NPPES record lists a practice address at 1200 EL Camino Real, South San Francisco, CA, 94080. Phone: (650) 742-2000. Providers update this record themselves, so call before visiting.
How can I verify Markus T. Leong, MD's license?
NPPES lists California license number A81198, 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 Markus T. Leong, MD prescribe under Medicare Part D?
In 2024, Markus T. Leong, MD had 196 Medicare Part D claims for 148 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Markus T. Leong, MD's MIPS final score?
The 2023 MIPS final score is 94.6 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.