Russell Evan Leong, M.D.
Allergy Physician · San Francisco, CA
Russell Evan Leong, M.D. is an allergy physician with a practice address in San Francisco, California, and NPI 1518961069, issued on Jun 10, 2005. Check the license (California G40648, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Russell Evan Leong
- Credential
- M.D.
- Primary taxonomy
- Allergy Physician 207KA0200X
- License number
- G40648 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3838 California St, San Francisco, CA 94118
- Phone
- (415) 221-0320
- Enumerated
- Jun 10, 2005
- Record last updated
- Jul 17, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (415) 221-0329
- Medicare enrollment
- Enrolled (PECOS I20090110000200); accepts Medicare assignment
- Medical or professional school
- Un Of California, Irvine, College Of Medicine, 1978
- Entity
- Type 1 · individual
8 nearest allergy physician records → All 157 in California → Look up another NPI →
Also registered at 3838 California St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Russell Evan Leong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G40648Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average allergy physician in 2024
22 Medicare Part D claims, against an average of 750 among the 645 providers of this specialty who prescribed in Part D.
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
- Sutter Bay Medical FoundationSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Russell Evan Leong among 157 allergy physician records in California
Russell Evan Leong, M.D. is one of 157 allergy physician records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated1978 · median 1992 among the 82 with a school on file
- Record last updated2007 · 70% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207KA0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy Physician providers in California
There are 157 allergy physician records in California.
All 157 in California → Every provider in San Francisco → Allergy Physician nationwide →
The 8 allergy physician records with the nearest ZIP codes
- Naveena Bobba, MDSan Francisco, CA 941101285705244
- Dean Kardassakis, MDSan Francisco, CA 941081811906571
- Julia Cronin, MDMountain View, CA 940401003080052
- Michael Mulligan, MDMountain View, CA 940401306884283
- Steven Rubinstein, M.D.Mountain View, CA 940401083664593
- Jack Levin, MDLos Altos, CA 940241063634434
- Betty Miller-Kolotkin, M.D.Daly City, CA 940151689786923
- Eugene Choi, MDBurlingame, CA 940101659529386
Common questions
What is Russell Evan Leong, M.D.'s NPI number?
Russell Evan Leong, M.D.'s National Provider Identifier (NPI) is 1518961069, issued on Jun 10, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Russell Evan Leong, M.D. located?
The NPPES record lists a practice address at 3838 California St, San Francisco, CA, 94118. Phone: (415) 221-0320. Providers update this record themselves, so call before visiting.
How can I verify Russell Evan Leong, M.D.'s license?
NPPES lists California license number G40648, 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 Russell Evan Leong, M.D. prescribe under Medicare Part D?
In 2024, Russell Evan Leong, M.D. had 22 Medicare Part D claims; the average among allergy physician prescribers was 750. 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.