Simon Chan, M.D.
Gastroenterology Physician · Antioch, CA
Simon Chan, M.D. is a gastroenterology physician with a practice address in Antioch, California, and NPI 1497762082, issued on Aug 3, 2006. Check the license (California A85162, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Simon Chan
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A85162 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4501 Sand Creek RD, Antioch, CA 94531
- Phone
- (925) 813-3707
- Enumerated
- Aug 3, 2006
- Record last updated
- Dec 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (925) 813-3701
- Medicare enrollment
- Enrolled (PECOS I20051208000684); accepts Medicare assignment
- Medical or professional school
- New York University School Of Medicine, 2002
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Also registered at 4501 Sand Creek RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Janel AfanadorPharmacist1356655880
- Rosilda AlvesClinical Psychologist1174670327
- Arnoldo Amador, RCPGeneral Care Registered Respiratory Therapist1487118436
- Veronica Arellano, RDRegistered Dietitian1740091354
- Lloyd Asuncion, MDInternal Medicine Physician1437353034
Verify Simon Chan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A85162Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% fewer Medicare Part D claims than the average gastroenterology physician in 2024
549 Medicare Part D claims for 192 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Gavilyte-C87 claims
- Omeprazole59 claims
- Sucralfate45 claims
- Mesalamine44 claims
- Xifaxan41 claims
- Famotidine34 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
- Permanente Medical Group IncAntioch, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Simon Chan among 2,140 gastroenterology physician records in California
Simon Chan, 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2002 · median 2002 among the 1,538 with a school on file
- Record last updated2021 · 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 Antioch → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Roshan PatelAntioch, CA 945311306137856
- Varun Takyar, MDAntioch, CA 945311851736961
- Richard Gould, M.D.Fairfield, CA 945331215980461
- Rashid Iqbal, MDFairfield, CA 945331942285879
- Merle Sogge, M.D.Fairfield, CA 945331619993243
- Mounzer Al Samman, M.D.Fairfield, CA 945341700822160
- Lawrence Chan, M.D.Fairfield, CA 945341356558332
- Nazia Hasan, M.D., M.P.H.Fairfield, CA 945341831394667
Common questions
What is Simon Chan, M.D.'s NPI number?
Simon Chan, M.D.'s National Provider Identifier (NPI) is 1497762082, issued on Aug 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Simon Chan, M.D. located?
The NPPES record lists a practice address at 4501 Sand Creek RD, Antioch, CA, 94531. Phone: (925) 813-3707. Providers update this record themselves, so call before visiting.
How can I verify Simon Chan, M.D.'s license?
NPPES lists California license number A85162, 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 Simon Chan, M.D. prescribe under Medicare Part D?
In 2024, Simon Chan, M.D. had 549 Medicare Part D claims for 192 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.