John Edward Mendelson, MD
Internal Medicine Physician · San Francisco, CA
John Edward Mendelson, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1891889341, issued on Oct 2, 2006. Check the license (California G49959, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Edward Mendelson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G49959 CA
Self-reported in NPPES; status is on the state search - Practice location
- 909 Hyde St, San Francisco, CA 94109
- Phone
- (415) 474-7900
- Enumerated
- Oct 2, 2006
- Record last updated
- Feb 5, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (415) 474-7930
- Medicaid ID
- G49959 CA
- Medicare enrollment
- Enrolled (PECOS I20070801000856); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1982
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 909 Hyde St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Edward Mendelson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G49959Check 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 internal medicine physician in 2024
99 Medicare Part D claims for 32 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Gabapentin31 claims
- Naltrexone Hcl20 claims
- Baclofen15 claims
- Topiramate11 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.
Bills Medicare through one group practice
- Ria Health PCSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Edward Mendelson among 17,696 internal medicine physician records in California
John Edward Mendelson, 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 fileYes · 63% of these records are
- Graduated1982 · median 2004 among the 11,065 with a school on file
- Record last updated2008 · 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
- Amy Bossen, M.D.San Francisco, CA 941091558371260
- Gary Chan, M.D.San Francisco, CA 941091699702324
- Guido Gores, MDSan Francisco, CA 941091528073996
- Edwin Hassid, M.D.San Francisco, CA 941091033140702
- Gayatri Khanna, M.D.San Francisco, CA 941091639191455
- Martin Liberman, MDSan Francisco, CA 941091376530006
- Deborah Lindes, M.D.San Francisco, CA 941091952323776
- Aravind Mani, MDSan Francisco, CA 941091932151941
Common questions
What is John Edward Mendelson, MD's NPI number?
John Edward Mendelson, MD's National Provider Identifier (NPI) is 1891889341, issued on Oct 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Edward Mendelson, MD located?
The NPPES record lists a practice address at 909 Hyde St, San Francisco, CA, 94109. Phone: (415) 474-7900. Providers update this record themselves, so call before visiting.
How can I verify John Edward Mendelson, MD's license?
NPPES lists California license number G49959, 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 John Edward Mendelson, MD prescribe under Medicare Part D?
In 2024, John Edward Mendelson, MD had 99 Medicare Part D claims for 32 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.