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Dr. Stephen Y. Chang, MD
NPI1770695793PAC ID3476592114
- Medicare services, 2024
- 767
- Medicare patients, 2024
- 483
- Part D claims, 2024
- 888
- Publications
- 1
- MIPS score, 2024
- 95
- Practice address
- 251 E Huron St, Chicago, IL 60611
- Practice phone
- Call (312) 926-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Chang's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Stephen Y. Chang is a gastroenterologist in Chicago, Illinois
Dr. Chang practices at Northwestern Memorial Hospital in Chicago, Illinois, part of Northwestern Memorial HealthCare.
Dr. Chang's NPI, 1770695793, was assigned on August 31, 2006. Dr. Chang graduated from University of Wisconsin School of Medicine in 1999. Dr. Chang holds Illinois license 036106945.
NPI and contact details
- NPI
- 1770695793NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3476592114
- NPI enumeration date
- August 31, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (312) 926-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Stephen Y. Chang practices at Northwestern Memorial Hospital in Chicago, Illinois
Dr. Chang's primary practice is Northwestern Memorial Hospital, at 251 E Huron St, Chicago, IL 60611 in Cook County. The practice phone is (312) 926-2000.
- Northwestern Memorial Hospital251 E Huron St, Chicago, IL 60611 · Cook CountyPhone(312) 926-2000
Source: Dmand AI Affiliation Data
Dr. Stephen Y. Chang is affiliated with 4 sites of care and 1 medical group
Dr. Chang's primary practice is Northwestern Memorial Hospital in Chicago, Illinois, part of Northwestern Memorial HealthCare. Dr. Chang is also affiliated with Northwestern Medicine Central DuPage Hospital. The medical group on file is Northwestern Medical Faculty Foundation. Dmand AI also links Dr. Chang to 1 more hospital and 1 group practice or clinic, each named with a free account.
Northwestern Medicine Central DuPage HospitalNorthwestern Medical Faculty Foundation1 hospitalName with a free account1 group practice or clinicName with a free account
See all 5 affiliations for Dr. ChangSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Stephen Y. Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwestern Memorial Hospital | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every hospital where Dr. Chang practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across Northwestern Memorial HealthCare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Stephen Y. Chang is one of 771 gastroenterologists in Illinois
Gastroenterology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Chang is licensed in Illinois.
Specialties and state licenses
- Gastroenterology, IllinoisPrimary
Gastroenterologists near Dr. Chang
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
771gastroenterologists in Illinois225gastroenterologists in Chicago32gastroenterologists at Northwestern Memorial Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Stephen Y. Chang billed Medicare for 767 services in 2024
CMS data shows 767 Medicare services from Dr. Chang across 14 procedure codes in 2024, for 483 Medicare patients. Medicare paid $81,571 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2024767
Medicare patients483
Paid by Medicare$81,571
Procedure codes14
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 2402024: 33339%
- Office and hospital visits
- 2023: 2232024: 29130%
- Other services
- 2023: 652024: 143120%
Dr. Chang compared with the Illinois median for gastroenterologists, 2024
- Dr. Chang
- Illinois median
- Medicare services
- 767vs 49854% above
- Medicare patients
- 483vs 30757% above
- Part D claims
- 761vs 3702.1 times
Medians across 757 gastroenterologists in Illinois with Dmand AI profiles that report each measure.
Dr. Chang's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Chang?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other gastroenterologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Stephen Y. Chang treated 483 Medicare patients in 2024, average age 72
CMS counts 483 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 237 patients. 75% of them have high cholesterol, and 67% have high blood pressure. 19% are also on Medicaid. Their average risk score is 1.53, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 68, with 57% women.
Medicare patients, 2024483
Average age72
Average risk score1.53
Also on Medicaid19%
Dr. Chang's Medicare patients by age, 2024
Dr. Chang's Medicare patients by sex, 2024
- Women29962%
- Men18438%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High cholesterol75%
- High blood pressure67%
- Arthritis45%
- Diabetes27%
- Ischemic heart disease27%
- Cancer25%
- Anxiety24%
- Chronic kidney disease23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women57%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Stephen Y. Chang wrote 888 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 888 Medicare Part D claims for 418 patients. 65% of them were for generic drugs. CMS names the drug for 761 of them, across 22 drugs with 11 or more claims each, at $121,440 in total drug cost. In 2023, CMS named 583 claims across 14 drugs.
Part D claims, 2024888
Drugs named by CMS22
Total drug cost$121,440
Part D patients418
Dr. Chang's Part D claims by kind of drug, 2024
- Generic573 claims65%
- Brand-name and other315 claims35%
Dr. Chang's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Chang's Part D claims, 2024
- Antibiotics5%46 of 888 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 5832024: 76131%
Drugs named by CMS: 22 in 2024, 14 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Stephen Y. Chang scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Chang for performance year 2024, reported through an alternative payment model (APM). Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chang as offering telehealth. CMS counts 98 procedures of colonoscopy by Dr. Chang, more than 79% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Chang's MIPS scores, performance year 2024
- 95of 100Final score
- 83of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Chang ranks in Medicare procedure volume
- Colonoscopy
- 79th percentile98 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 69th percentile68 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Stephen Y. Chang has 1 publication on record
Dmand AI links 1 paper to Dr. Chang in 2020. Dr. Chang's most frequent co-authors are Srinadh Komanduri, MD, John E. Pandolfino, MD and Christian G. Stevoff, MD.
Papers1
Dr. Chang's most frequent co-authors
- Srinadh Komanduri, MD1 shared paper
- John E. Pandolfino, MD1 shared paper
- Christian G. Stevoff, MD1 shared paper
Recent publications by Dr. Chang
See who Dr. Chang researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chang works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Stephen Y. Chang received $399 in industry payments from 2018 to 2024
CMS Open Payments shows 5 general payments to Dr. Chang from 5 drug and device companies from 2018 to 2024. Honoraria make up the largest share, 63% of the total. GI Supply, Inc. paid the most, $250.
General payments to Dr. Chang by program year, 2018 to 2024
General payments to Dr. Chang by kind, 2018 to 2024
$399in total
- Honoraria$25063%
- Food and beverage$14937%
Companies that paid Dr. Chang the most, 2018 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Stephen Y. Chang graduated from University of Wisconsin School of Medicine
Dr. Chang graduated from University of Wisconsin School of Medicine in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Stephen Y. Chang's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Stephen Y. Chang
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Stephen Y. Chang's NPI number?
Dr. Stephen Y. Chang's NPI number is 1770695793. It was assigned on August 31, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Stephen Y. Chang?
Dr. Stephen Y. Chang is a gastroenterologist in Chicago, Illinois. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Stephen Y. Chang practice?
Dr. Chang practices at 251 E Huron St, Chicago, IL 60611. Dr. Chang's primary practice is Northwestern Memorial Hospital in Chicago, Illinois, part of Northwestern Memorial HealthCare. Dmand AI also links Dr. Chang to 1 hospital and 1 group practice or clinic.
What is Dr. Stephen Y. Chang's office phone number?
The practice phone on file for Dr. Chang is (312) 926-2000.
What is Dr. Stephen Y. Chang's medical license number?
Dr. Chang holds Illinois license 036106945.
Which hospitals is Dr. Stephen Y. Chang affiliated with?
Dr. Chang practices at Northwestern Memorial Hospital in Chicago, Illinois. Dr. Chang is also affiliated with Northwestern Medicine Central DuPage Hospital. Dmand AI links Dr. Chang to 1 more hospital.
What medical group is Dr. Stephen Y. Chang part of?
Dr. Chang is linked to Northwestern Medical Faculty Foundation.
Does Dr. Stephen Y. Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 767 services in 2024, and Dr. Chang accepts Medicare assignment.
Does Dr. Stephen Y. Chang offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chang as offering telehealth services.
What is Dr. Stephen Y. Chang's MIPS score?
Dr. Chang's MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. Stephen Y. Chang see?
CMS counts 483 Medicare patients who saw Dr. Chang in 2024, with an average age of 72.
What services does Dr. Stephen Y. Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were surgery: digestive system (45385), office visit, established patient (99213) and surgery: digestive system (45380).
Where did Dr. Stephen Y. Chang go to medical school?
Dr. Chang graduated from University of Wisconsin School of Medicine in 1999.
What drugs does Dr. Stephen Y. Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Peg 3350-Electrolyte, Sod Sulf-Potass Sulf-Mag Sulf and Omeprazole.
Has Dr. Stephen Y. Chang received payments from drug or device companies?
CMS Open Payments shows $399 in general payments to Dr. Chang from 5 companies from 2018 to 2024. The largest total came from GI Supply, Inc.
How long has Dr. Stephen Y. Chang been practicing?
Dr. Chang graduated from medical school in 1999, 27 years ago.
Does Dr. Stephen Y. Chang do research?
Dmand AI links 1 publication to Dr. Chang.
Who does Dr. Stephen Y. Chang publish with?
Dr. Chang's most frequent co-authors are Srinadh Komanduri, MD (1 shared paper), John E. Pandolfino, MD (1 shared paper) and Christian G. Stevoff, MD (1 shared paper).
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