Mark K. Chang, M.D.
NPI 1871607507ActiveIndividual· Orthopaedic Surgery· Dyer, IN
Orthopaedic Surgery (M.D.) in Dyer, Indiana, trained at Medical University of South Carolina College of Medicine (class of 1990). 441 Medicare patients in 2024, $208,110 paid; nearly all of their 2,600 Part D prescriptions were generic (99%). Medyssey USA, Inc was the largest of 7 companies reporting payments in 2025, $16,353 in all, mostly consulting fees.
Overview
| NPI | 1871607507 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Aug 19, 2006 |
| Last updated in NPPES | Feb 5, 2025 |
| Certified by provider | Feb 5, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery Primary | 207X00000X | 036095817 | IL |
| Orthopaedic Surgery | 207X00000X | 200033540A | IN |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Orthopedic Surgery (IL); Practitioner - Orthopedic Surgery (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 441 |
|---|---|
| Services billed | 2,212 across 55 procedure codes |
| Paid by Medicare | $208,110 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,600 · 2,797 30-day fills |
|---|---|
| Patients | 403 |
| Total drug cost | $56,937 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | Medical University of South Carolina College of Medicine |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Orthopedic Surgery |
Hospital affiliations
- Advocate Trinity HospitalChicago, IL
- Community HospitalMunster, IN
- Ingalls Memorial HospitalHarvey, IL
- St Catherine Hospital IncEast Chicago, IN
- St Mary Medical Center IncHobart, IN
Other facilities
- Powers Health Rehabilitation CenterInpatient rehabilitation facility · Crown Point, IN
Industry payments (Open Payments)
- 2025$16,353 · 11 payments from 7 companies
- 2024$32,717 · 23 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medyssey USA, Inc | $16,000 | 4 |
| Arteriocyte Medical Systems, Inc. | $158.33 | 1 |
| Abbott Laboratories | $85.89 | 2 |
| Medtronic, Inc. | $32.81 | 1 |
| Abbvie Inc. | $29.39 | 1 |
What the 2025 payments were for
- Consulting Fee$16,000 · 4 payments
- Food and Beverage$352.97 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other orthopedic surgeons in Dyer
- 1801345343