Mark Wan Soo Chang, MD
NPI 1174632475ActiveIndividual· Internal Medicine, Interventional Cardiology· Johnson City, TN
Internal Medicine, Interventional Cardiology (MD) in Johnson City, Tennessee, trained at Columbia University College of Physicians and Surgeons (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $592,710 for 3,015 claims, against $41,151 paid for services in 2024. Zoll Services LLC (A/K/A Zoll Lifecor Corp) was the largest of 9 companies reporting payments in 2025, $736.80 in all, mostly food and beverage.
Overview
| NPI | 1174632475 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 30, 2006 |
| Last updated in NPPES | Dec 3, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Interventional Cardiology Primary | 207RI0011X | 28931 | TN |
| Internal Medicine, Interventional Cardiology | 207RI0011X | 0101059203 | VA |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 28931 | TN |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 0101059203 | VA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Cardiovascular Disease (Cardiology) (TN); Practitioner - Cardiovascular Disease (Cardiology) (VA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 411 |
|---|---|
| Services billed | 788 across 52 procedure codes |
| Paid by Medicare | $41,151 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,015 · 7,176 30-day fills |
|---|---|
| Patients | 511 |
| Total drug cost | $592,710 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | Columbia University College of Physicians and Surgeons |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Wellmont Cardiology ServicesMarion, VA · 139 clinicians
Hospital affiliations
- Franklin Woods Community HospitalJohnson City, TN
- Greeneville Community HospitalGreeneville, TN
- Johnson City Medical CenterJohnson City, TN
- Sycamore Shoals HospitalElizabethton, TN
- Wellmont Holston Valley Medical CenterKingsport, TN
Industry payments (Open Payments)
- 2025$736.80 · 56 payments from 9 companies
- 2024$395.44 · 22 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $209.95 | 23 |
| Novartis Pharmaceuticals Corporation | $150.32 | 8 |
| E.R. Squibb & Sons, L.L.C. | $146.85 | 14 |
| Abbott Laboratories | $107.17 | 5 |
| Cardiva Medical, Inc. | $34.63 | 1 |
What the 2025 payments were for
- Food and Beverage$736.80 · 56 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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