Stephen Y. Chang, MD
Gastroenterology Physician · Chicago, IL
Stephen Y. Chang, MD is a gastroenterology physician with a practice address in Chicago, Illinois, and NPI 1770695793, issued on Aug 31, 2006. Check the license (Illinois 036106945, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Stephen Y. Chang
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 036106945 IL
Self-reported in NPPES; status is on the state search - Practice location
- 675 N Saint Clair St, Chicago, IL 60611
- Phone
- (312) 695-5620
- Enumerated
- Aug 31, 2006
- Record last updated
- Jun 25, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (312) 695-7095
- Medicaid ID
- 036106945 IL
- Medicare enrollment
- Enrolled (PECOS I20050502000697); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Also registered at 675 N Saint Clair St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sonya Agnew, M.D.Plastic Surgery Physician1962640250
- Mohammed Alghoul, M.D.Plastic Surgery Physician1932376746
- Sharon Allen, APRNAdult Health Nurse Practitioner1003849993
Verify Stephen Y. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036106945Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% more Medicare Part D claims than the average gastroenterology physician in 2024
888 Medicare Part D claims for 418 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Peg 3350-Electrolyte156 claims
- Sod Sulf-Potass Sulf-Mag Sulf132 claims
- Omeprazole128 claims
- Linzess41 claims
- Pantoprazole Sodium39 claims
- Famotidine27 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.
The MIPS final score for 2023 (Medicare payment program): 94.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $17.53
1 payment: food and beverage; the largest payer was Olympus America 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
- Northwestern Medical Faculty FoundationChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Stephen Y. Chang among 887 gastroenterology physician records in Illinois
Stephen Y. Chang, MD is one of 887 gastroenterology physician records with a practice address in Illinois. 85% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 52% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1999 · median 2003 among the 643 with a school on file
- Record last updated2015 · 49% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Illinois
There are 887 gastroenterology physician records in Illinois.
All 887 in Illinois → Every provider in Chicago → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Greg Cohen, M.D.Chicago, IL 606111669447348
- Maria Ferreira, MDChicago, IL 606111194755421
- Robin Fintel, M.D.Chicago, IL 606111023083250
- Steven Flamm, MDChicago, IL 606111912937244
- Melvin Goldstein, M.D.Chicago, IL 606111376531400
- Nirmala Gonsalves, MDChicago, IL 606111326038712
- Richard Green, MDChicago, IL 606111770511404
- Joseph Karacic, MDChicago, IL 606111992798417
Common questions
What is Stephen Y. Chang, MD's NPI number?
Stephen Y. Chang, MD's National Provider Identifier (NPI) is 1770695793, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Y. Chang, MD located?
The NPPES record lists a practice address at 675 N Saint Clair St, Chicago, IL, 60611. Phone: (312) 695-5620. Providers update this record themselves, so call before visiting.
How can I verify Stephen Y. Chang, MD's license?
NPPES lists Illinois license number 036106945, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Stephen Y. Chang, MD prescribe under Medicare Part D?
In 2024, Stephen Y. Chang, MD had 888 Medicare Part D claims for 418 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Stephen Y. Chang, MD's MIPS final score?
The 2023 MIPS final score is 94.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.