Clare C. Siu, MD
Internal Medicine Physician · San Francisco, CA
Clare C. Siu, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1568579019, issued on Aug 23, 2006. Check the license (California G 74223, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Clare C. Siu
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G 74223 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4322 Geary Blvd, San Francisco, CA 94118
- Phone
- (415) 876-2748
- Enumerated
- Aug 23, 2006
- Record last updated
- Jul 21, 2022
- Fax
- (415) 876-2707
- Medicaid ID
- 00G742230 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4322 Geary Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Janet MichelsonNurse Practitioner1073721239
- Monita Yuen-Green, M.D.Internal Medicine Physician1013000868
Verify Clare C. Siu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G 74223Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,453 Medicare Part D claims for 151 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
Most prescribed
- Amlodipine Besylate147 claims
- Atorvastatin Calcium123 claims
- Metformin Hcl Er77 claims
- Simvastatin74 claims
- Metoprolol Succinate71 claims
- Losartan Potassium69 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.
Industry payments in 2024: $42.78
2 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Clare C. Siu among 17,696 internal medicine physician records in California
Clare C. Siu, 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2022 · 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).
1,318 internal medicine physician records list a practice address in San Francisco
They are 1,318 of the 38,143 NPPES records with a practice address in San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Francisco → Internal Medicine Physician nationwide →
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Common questions
What is Clare C. Siu, MD's NPI number?
Clare C. Siu, MD's National Provider Identifier (NPI) is 1568579019, issued on Aug 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Clare C. Siu, MD located?
The NPPES record lists a practice address at 4322 Geary Blvd, San Francisco, CA, 94118. Phone: (415) 876-2748. Providers update this record themselves, so call before visiting.
How can I verify Clare C. Siu, MD's license?
NPPES lists California license number G 74223, 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 Clare C. Siu, MD prescribe under Medicare Part D?
In 2024, Clare C. Siu, MD had 1,453 Medicare Part D claims for 151 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.