A report from the UW Center for Research on the Wisconsin Economy says Wisconsin hospital costs are approximately 26 percent higher than Illinois costs overall.
The report compares hospital prices between Wisconsin and Illinois using commercial negotiated-rate data drawn from hospital and payer price-transparency filings. The analysis covers roughly 70 hospitals in Illinois and 60 in Wisconsin, spanning dozens of health systems and a set of high-spend inpatient services, for the Blue plan and UnitedHealthcare in each state.
Controlling for the specific service and payer, Wisconsin negotiated rates exceed Illinois rates by approximately 26 percent.
The premium persists within the same health system. Advocate Health operates hospitals on both sides of the Illinois–Wisconsin border. Within this single system, holding corporate governance, brand, and clinical scope constant, Wisconsin hospitals are paid about 23 percent more for inpatient services than the system’s Illinois hospitals.
The premium is broad and consistent. The two carriers with robust negotiated dollar-value contracts in both states, the Blue plan and UnitedHealthcare, independently show nearly identical inpatient premiums of +25.8 percent and +25.4 percent, indicating that the gap is a feature of the Wisconsin provider market rather than any single insurer’s contracting strategy. Every one of the 24 inpatient procedures examined is more expensive in Wisconsin, spanning obstetric, surgical, cardiovascular, and medical service lines.
Taken together, these findings point to market structure, rather than service mix, hospital type, or insurer behavior, as the leading candidate explanation for Wisconsin’s elevated hospital prices.
Subsequent phases will investigate hospital consolidation, service-line restructuring, and the emergence of provider-sponsored health plans as potential structural drivers of these patterns.
Read the full report here: Hospital Prices in Wisconsin and Illinois: A Cross-State Comparison
