Dr. Gene Lee Chang, MD
- Medicare services, 2024
- 981
- Medicare patients, 2024
- 745
- Part D claims, 2024
- 987
- Hospital affiliations
- 2
- Industry payments
- $18,039
- Practice address
- 901 Macarthur Blvd, Munster, IN 46321
- Practice phone
- Call (219) 836-1600
- 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
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Dr. Gene Lee Chang is a gastroenterologist in Munster, Indiana
Dr. Chang practices at Community Hospital in Munster, Indiana, part of Community Healthcare System.
Dr. Chang's NPI, 1033240411, was assigned on March 8, 2007. Dr. Chang graduated from Chicago College of Medicine and Surgery in 2001.
- NPI
- 1033240411NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2769579507
- NPI enumeration date
- March 8, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (219) 836-1600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gene Lee Chang practices at Community Hospital in Munster, Indiana
Dr. Chang's primary practice is Community Hospital, at 901 Macarthur Blvd, Munster, IN 46321 in Lake County. The practice phone is (219) 836-1600.
- Community Hospital901 Macarthur Blvd, Munster, IN 46321 · Lake CountyPhone(219) 836-1600
Source: Dmand AI Affiliation Data
Dr. Gene Lee Chang is affiliated with 4 sites of care and 1 medical group
Dr. Chang's primary practice is Community Hospital in Munster, Indiana, part of Community Healthcare System. Dr. Chang is also affiliated with Powers Health Rehabilitation Center. The medical group on file is Powers Health Medical Group. Dmand AI also links Dr. Chang to 1 more physician office and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gene Lee 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 |
|---|---|
| Community Hospital | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gene Lee Chang is one of 333 gastroenterologists in Indiana
Gastroenterology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Chang has a license on file in Illinois.
Specialties and state licenses
- Gastroenterology, Illinois
Gastroenterologists near Dr. Chang
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gene Lee Chang billed Medicare for 981 services in 2024
CMS data shows 981 Medicare services from Dr. Chang across 9 procedure codes in 2024, for 745 Medicare patients. Medicare paid $117,951 for them.
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 9312024: 79615%
- Other services
- 2023: 1002024: 14141%
- Office and hospital visits
- 2023: 2302024: 4481%
Where Dr. Chang's Medicare services took place, 2024
- In an office263%
- In a facility95597%
Dr. Chang compared with the Indiana median for gastroenterologists, 2024
- Dr. Chang
- Indiana median
- Medicare services
- 981vs 4712.1 times
- Medicare patients
- 745vs 3092.4 times
- Part D claims
- 835vs 42298% above
Medians across 330 gastroenterologists in Indiana 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other gastroenterologists in Indiana.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gene Lee Chang treated 745 Medicare patients in 2024, average age 72
CMS counts 745 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 439 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 4% are also on Medicaid. Their average risk score is 0.99, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 70, with 52% women.
Dr. Chang's Medicare patients by age, 2024
Dr. Chang's Medicare patients by sex, 2024
- Women40755%
- Men33845%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis51%
- Ischemic heart disease31%
- Diabetes29%
- Anxiety20%
- Chronic kidney disease20%
- Cancer19%
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 70
Patient panel by sex, all payers
- Women52%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gene Lee Chang wrote 987 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 987 Medicare Part D claims for 525 patients. 77% of them were for generic drugs. CMS names the drug for 835 of them, across 9 drugs with 11 or more claims each, at $107,483 in total drug cost. In 2023, CMS named 1,078 claims across 16 drugs.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic756 claims77%
- Brand-name231 claims23%
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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,0782024: 83523%
Drugs named by CMS: 9 in 2024, 16 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. Gene Lee Chang ranks in the 97th percentile for colonoscopy in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 292 procedures of colonoscopy by Dr. Chang, more than 97% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Chang ranks in Medicare procedure volume
- Colonoscopy
- 97th percentile292 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 94th percentile265 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Gene Lee Chang received $18,039 in industry payments from 2016 to 2025
CMS Open Payments shows 808 general payments to Dr. Chang from 39 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 80% of the total. Sebela Pharmaceuticals Inc. paid the most, $3,584.
General payments to Dr. Chang by program year, 2016 to 2025
General payments to Dr. Chang by kind, 2016 to 2025
- Food and beverage$14,45080%
- Grants$3,00017%
- Gifts$2441%
- Speaker and faculty fees$2001%
- Education$1451%
Companies that paid Dr. Chang the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gene Lee Chang graduated from Chicago College of Medicine and Surgery
Dr. Chang graduated from Chicago College of Medicine and Surgery in 2001.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gene Lee 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)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| 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. Gene Lee 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. Gene Lee Chang's NPI number?
Dr. Gene Lee Chang's NPI number is 1033240411. It was assigned on March 8, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Gene Lee Chang?
Dr. Gene Lee Chang is a gastroenterologist in Munster, Indiana. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Gene Lee Chang practice?
Dr. Chang practices at 901 Macarthur Blvd, Munster, IN 46321. Dr. Chang's primary practice is Community Hospital in Munster, Indiana, part of Community Healthcare System. Dmand AI also links Dr. Chang to 1 physician office and 1 group practice or clinic.
What is Dr. Gene Lee Chang's office phone number?
The practice phone on file for Dr. Chang is (219) 836-1600.
Which hospitals is Dr. Gene Lee Chang affiliated with?
Dr. Chang practices at Community Hospital in Munster, Indiana. Dr. Chang is also affiliated with Powers Health Rehabilitation Center.
What medical group is Dr. Gene Lee Chang part of?
Dr. Chang is linked to Powers Health Medical Group.
Does Dr. Gene Lee Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 981 services in 2024, and Dr. Chang accepts Medicare assignment.
How many Medicare patients does Dr. Gene Lee Chang see?
CMS counts 745 Medicare patients who saw Dr. Chang in 2024, with an average age of 72.
What services does Dr. Gene Lee Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were surgery: digestive system (45385), surgery: digestive system (43239) and surgery: digestive system (45380).
Where did Dr. Gene Lee Chang go to medical school?
Dr. Chang graduated from Chicago College of Medicine and Surgery in 2001.
Show 3 more questionsShow fewer questions
What drugs does Dr. Gene Lee Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Pantoprazole Sodium, Sod Sulf-Potass Sulf-Mag Sulf and Sutab.
Has Dr. Gene Lee Chang received payments from drug or device companies?
CMS Open Payments shows $18,039 in general payments to Dr. Chang from 39 companies from 2016 to 2025. The largest total came from Sebela Pharmaceuticals Inc.
How long has Dr. Gene Lee Chang been practicing?
Dr. Chang graduated from medical school in 2001, 25 years ago.
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