Allison Wei-Sum Leung, M.D.
Internal Medicine Physician · Los Angeles, CA
Allison Wei-Sum Leung, M.D. is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1407148224, issued on May 12, 2011. Check the license (California 136663, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Allison Wei-Sum Leung
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 136663 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11980 San Vicente Blvd, Los Angeles, CA 90049
- Phone
- (310) 208-7777
- Enumerated
- May 12, 2011
- Record last updated
- Nov 4, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150831000733); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 2011
- 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 11980 San Vicente Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Allison Wei-Sum Leung in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 136663Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,990 Medicare Part D claims for 241 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 29 claims were for opioids.
Most prescribed
- Atorvastatin Calcium205 claims
- Amlodipine Besylate100 claims
- Pravastatin Sodium84 claims
- Losartan Potassium82 claims
- Gabapentin80 claims
- Levothyroxine Sodium52 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
- The Regents OF The University OF CaliforniaLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Allison Wei-Sum Leung among 17,696 internal medicine physician records in California
Allison Wei-Sum Leung, M.D. 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 2011, is newer than 66% of them.
- NPI issued2011 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2011 · median 2004 among the 11,065 with a school on file
- Record last updated2015 · 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 →
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Common questions
What is Allison Wei-Sum Leung, M.D.'s NPI number?
Allison Wei-Sum Leung, M.D.'s National Provider Identifier (NPI) is 1407148224, issued on May 12, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Allison Wei-Sum Leung, M.D. located?
The NPPES record lists a practice address at 11980 San Vicente Blvd, Los Angeles, CA, 90049. Phone: (310) 208-7777. Providers update this record themselves, so call before visiting.
How can I verify Allison Wei-Sum Leung, M.D.'s license?
NPPES lists California license number 136663, 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 Allison Wei-Sum Leung, M.D. prescribe under Medicare Part D?
In 2024, Allison Wei-Sum Leung, M.D. had 1,990 Medicare Part D claims for 241 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.