Mark James Chyna, M.D.
NPI 1740273507ActiveIndividual· Internal Medicine· Libertyville, IL
Internal Medicine (M.D.) in Libertyville, Illinois, trained at University of Chicago, Pritzker School of Medicine (class of 1993). Their prescriptions cost Medicare Part D more than their services did: $248,000 for 2,152 claims, against $28,188 paid for services in 2024. Intuitive Surgical, Inc. reported $217.88 in payments in 2024, mostly food and beverage.
Overview
| NPI | 1740273507 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 26, 2005 |
| Last updated in NPPES | Dec 26, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036-092429 | IL |
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 - Internal Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 109 |
|---|---|
| Services billed | 366 across 14 procedure codes |
| Paid by Medicare | $28,188 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,152 · 5,111 30-day fills |
|---|---|
| Patients | 138 |
| Total drug cost | $248,000 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | University of Chicago, Pritzker School of Medicine |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Internal Medicine |
Hospital affiliations
- Advocate Condell Medical CenterLibertyville, IL
- Advocate Good Shepherd HospitalBarrington, IL
- Northwestern Lake Forest HospitalLake Forest, IL
Industry payments (Open Payments)
- 2024$217.88 · 2 payments from 1 company
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Intuitive Surgical, Inc. | $217.88 | 2 |
What the 2024 payments were for
- Food and Beverage$217.88 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 43 internal medicine physicians in Libertyville · All internal medicine physicians in Illinois