Timothy Liu, M.D., M.S.
Internal Medicine Physician · Kentfield, CA
Timothy Liu, M.D., M.S. is an internal medicine physician with a practice address in Kentfield, California, and NPI 1134495450, issued on Mar 30, 2012. Check the license (California A128408, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Timothy Liu
- Credential
- M.D., M.S.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A128408 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1125 Sir Francis Drake Blvd, Kentfield, CA 94904
- Phone
- (415) 456-9680
- Enumerated
- Mar 30, 2012
- Record last updated
- Jul 12, 2023
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1125 Sir Francis Drake Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Timothy Liu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A128408Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average internal medicine physician in 2024
677 Medicare Part D claims for 195 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 120 claims were for opioids.
Most prescribed
- Oxycodone Hcl35 claims
- Hydrocodone-Acetaminophen32 claims
- Lantus Solostar24 claims
- Levothyroxine Sodium24 claims
- Atorvastatin Calcium22 claims
- Furosemide16 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.
Timothy Liu among 17,696 internal medicine physician records in California
Timothy Liu, M.D., M.S. 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 2012, is newer than 68% of them.
- NPI issued2012 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2023 · 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).
9 internal medicine physician records list a practice address in Kentfield
They are 9 of the 225 NPPES records with a practice address in Kentfield, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Kentfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Fariba Amiri, M.D.Greenbrae, CA 949041851340194
- David Berman, M.D.Greenbrae, CA 949041548245921
- Thato Brumwell, M.D.Greenbrae, CA 949041750311494
- Aida Calvillo, MDGreenbrae, CA 949041225031727
- Catharine Clark-Sayles, M.D.Greenbrae, CA 949041518952860
- Susan Cumming, M.D.Greenbrae, CA 949041548285075
- Anne Cummings, M.D.Greenbrae, CA 949041619917028
- Kerry Davidson, M.D.Greenbrae, CA 949041063430106
Common questions
What is Timothy Liu, M.D., M.S.'s NPI number?
Timothy Liu, M.D., M.S.'s National Provider Identifier (NPI) is 1134495450, issued on Mar 30, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Timothy Liu, M.D., M.S. located?
The NPPES record lists a practice address at 1125 Sir Francis Drake Blvd, Kentfield, CA, 94904. Phone: (415) 456-9680. Providers update this record themselves, so call before visiting.
How can I verify Timothy Liu, M.D., M.S.'s license?
NPPES lists California license number A128408, 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 Timothy Liu, M.D., M.S. prescribe under Medicare Part D?
In 2024, Timothy Liu, M.D., M.S. had 677 Medicare Part D claims for 195 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.