Joel Lopez, M.D.
Internal Medicine Physician · San Francisco, CA
Joel Lopez, M.D. is an internal medicine physician with a practice address in San Francisco, California, and NPI 1376679910, issued on Feb 26, 2007. Check the license (California C51357, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joel Lopez
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C51357 CA
Self-reported in NPPES; status is on the state search - Practice location
- 345 W Portal Ave FL 2, San Francisco, CA 94127
- Phone
- (415) 566-1000
- Enumerated
- Feb 26, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (415) 665-6732
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Joel Lopez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C51357Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
15 Medicare Part D claims, 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.
Joel Lopez among 17,696 internal medicine physician records in California
Joel Lopez, 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2007 · 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 →
The 8 internal medicine physician records with the nearest ZIP codes
- Richard Chin, M.D.San Francisco, CA 941271588825640
- Petia Kremen, MDSan Francisco, CA 941271861570418
- Neil Solomon, M.D.San Francisco, CA 941271861598450
- Mary Jean Stempien, M.D.San Francisco, CA 941271073734521
- Chelsea Thomsen, M.D., M.S.P.HSan Francisco, CA 941271003227927
- Silva Yuen, MDSan Francisco, CA 941271336201755
- John Hall, MDSan Francisco, CA 941251861423600
- Ross Quinn, MDSan Francisco, CA 941241871082602
Common questions
What is Joel Lopez, M.D.'s NPI number?
Joel Lopez, M.D.'s National Provider Identifier (NPI) is 1376679910, issued on Feb 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Joel Lopez, M.D. located?
The NPPES record lists a practice address at 345 W Portal Ave FL 2, San Francisco, CA, 94127. Phone: (415) 566-1000. Providers update this record themselves, so call before visiting.
How can I verify Joel Lopez, M.D.'s license?
NPPES lists California license number C51357, 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 Joel Lopez, M.D. prescribe under Medicare Part D?
In 2024, Joel Lopez, M.D. had 15 Medicare Part D claims; 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.