Stephen Chan, MD
Internal Medicine Physician · San Francisco, CA
Stephen Chan, MD is an internal medicine physician with a practice address in San Francisco, California, and NPI 1982109138, issued on Mar 29, 2018. Check the license (California 1261389, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen Chan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 1261389 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2100 Webster St, San Francisco, CA 94115
- Phone
- (415) 600-2402
- Enumerated
- Mar 29, 2018
- Record last updated
- Jul 15, 2022
- Fax
- (415) 369-1292
- Medicare enrollment
- Enrolled (PECOS I20210610002259); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2018
- 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 2100 Webster St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arthur Allen, MDOphthalmology Physician1255332334
- Anait Ambarian, ODOptometrist1992032411
- Peter Anastassiou, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1912904806
- William Andereck, M.D.Internal Medicine Physician1699800219
- Jennifer Austin, LCSWClinical Social Worker1669878492
- Amy Baertson, R.DRegistered Dietitian1598914202
Verify Stephen Chan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 1261389Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3% more Medicare Part D claims than the average internal medicine physician in 2024
3,270 Medicare Part D claims for 423 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 50 claims were for opioids.
Most prescribed
- Atorvastatin Calcium357 claims
- Amlodipine Besylate182 claims
- Losartan Potassium132 claims
- Levothyroxine Sodium117 claims
- Tamsulosin Hcl93 claims
- Lisinopril86 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
- Sutter Bay Medical FoundationSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Chan among 17,696 internal medicine physician records in California
Stephen Chan, 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 2018, is newer than 84% of them.
- NPI issued2018 · 84% of these records are older, 14% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2018 · median 2004 among the 11,065 with a school on file
- 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 →
The 8 internal medicine physician records with the nearest ZIP codes
- Gary Arsham, M.D.San Francisco, CA 941151487646758
- Richard Caplin, M.D.San Francisco, CA 941151568443455
- C Cooney, M.D.San Francisco, CA 941151255332094
- Sarita Dubey, MDSan Francisco, CA 941151316905466
- Meredith Heller, M.D.San Francisco, CA 941151073562096
- Alan Leung, MDSan Francisco, CA 941151245222330
- Susan Nguyen, MDSan Francisco, CA 941151164470696
- Daniel Null, MDSan Francisco, CA 941151689638744
Common questions
What is Stephen Chan, MD's NPI number?
Stephen Chan, MD's National Provider Identifier (NPI) is 1982109138, issued on Mar 29, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Chan, MD located?
The NPPES record lists a practice address at 2100 Webster St, San Francisco, CA, 94115. Phone: (415) 600-2402. Providers update this record themselves, so call before visiting.
How can I verify Stephen Chan, MD's license?
NPPES lists California license number 1261389, 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 Stephen Chan, MD prescribe under Medicare Part D?
In 2024, Stephen Chan, MD had 3,270 Medicare Part D claims for 423 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.