Tiffany Irene Leung, MD
Internal Medicine Physician · Stanford, CA
Tiffany Irene Leung, MD is an internal medicine physician with a practice address in Stanford, California, and NPI 1679739957, issued on Aug 5, 2008. Check the license (California A125004, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tiffany Irene Leung
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- A125004 CA
125054158 IL
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Aug 5, 2008
- Record last updated
- Jan 30, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicaid ID
- 036127686 IL
- Entity
- Type 1 · individual
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Verify Tiffany Irene Leung in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A125004Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
21 Medicare Part D claims for 16 beneficiaries, against an average of 3,176 among the 108,855 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.
Tiffany Irene Leung among 17,696 internal medicine physician records in California
Tiffany Irene Leung, MD 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 2008, is newer than 56% of them.
- NPI issued2008 · 56% of these records are older, 40% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2014 · 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).
378 internal medicine physician records list a practice address in Stanford
They are 378 of the 5,606 NPPES records with a practice address in Stanford, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Stanford → Internal Medicine Physician nationwide →
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Common questions
What is Tiffany Irene Leung, MD's NPI number?
Tiffany Irene Leung, MD's National Provider Identifier (NPI) is 1679739957, issued on Aug 5, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Tiffany Irene Leung, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Tiffany Irene Leung, MD's license?
NPPES lists California license number A125004, 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 Tiffany Irene Leung, MD prescribe under Medicare Part D?
In 2024, Tiffany Irene Leung, MD had 21 Medicare Part D claims for 16 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.