Joseph Chen, M.D.
Gastroenterology Physician · San Francisco, CA
Joseph Chen, M.D. is a gastroenterology physician with a practice address in San Francisco, California, and NPI 1558500603, issued on Feb 12, 2009. Check the license (California A88094, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joseph Chen
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A88094 CA
Self-reported in NPPES; status is on the state search - Practice location
- Department OF Gastroenterology 513 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 443-4692
- Enumerated
- Feb 12, 2009
- Record last updated
- Feb 11, 2022
- Medicare enrollment
- Enrolled (PECOS I20100304000272); accepts Medicare assignment
- Medical or professional school
- Washington University School Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify Joseph Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A88094Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% more Medicare Part D claims than the average gastroenterology physician in 2024
1,077 Medicare Part D claims for 528 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Gavilyte-C316 claims
- Pantoprazole Sodium203 claims
- Famotidine86 claims
- Mesalamine43 claims
- Budesonide Dr37 claims
- Xifaxan37 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: $1,018.55
4 payments; by number, the most common kind was travel and lodging; the largest payer was Intuitive Surgical, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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.
Bills Medicare through one group practice
- Permanente Medical Group IncVallejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph Chen among 2,140 gastroenterology physician records in California
Joseph Chen, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 69% of them.
- NPI issued2009 · 69% of these records are older, 28% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2003 · median 2002 among the 1,538 with a school on file
- Record last updated2022 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in San Francisco → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Kendall BeckSan Francisco, CA 941431972892057
- John Cello, MDSan Francisco, CA 941431346205168
- Jennifer Chen, MDSan Francisco, CA 941431376771758
- Lukejohn Day, M.D.San Francisco, CA 941431669623773
- Jeanne-Marie GiardSan Francisco, CA 941431194134460
- Courtney Gonzales, M.D.San Francisco, CA 941431669708830
- Abdul Kouanda, MDSan Francisco, CA 941431144648833
- Timothy Lu, M.D., PH.D.San Francisco, CA 941431922258169
Common questions
What is Joseph Chen, M.D.'s NPI number?
Joseph Chen, M.D.'s National Provider Identifier (NPI) is 1558500603, issued on Feb 12, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Chen, M.D. located?
The NPPES record lists a practice address at Department OF Gastroenterology 513 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 443-4692. Providers update this record themselves, so call before visiting.
How can I verify Joseph Chen, M.D.'s license?
NPPES lists California license number A88094, 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 Joseph Chen, M.D. prescribe under Medicare Part D?
In 2024, Joseph Chen, M.D. had 1,077 Medicare Part D claims for 528 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.