Practice patterns, case mix, Medicare payment policy, and dialysis facility costs

Area of Science:

• Nephrology
• Health Economics
• Healthcare Management

Background:

• Dialysis costs are a significant concern in end-stage renal disease (ESRD) care.
• Understanding cost drivers is crucial for effective payment policies and resource allocation.

Purpose of the Study:

• To evaluate the impact of case mix, practice patterns, payment systems, and facility characteristics on dialysis costs.
• To identify key determinants of cost variations across dialysis units.

Main Methods:

• Utilized a nationally representative sample from the 1991 U.S. Renal Data System's Case Mix Adequacy (CMA) Study.
• Merged CMA data with Medicare Cost Reports, HCFA facility surveys, and ESRD patient registry data.
• Estimated a statistical cost function to analyze dialysis unit-level cost determinants.

Main Results:

• Case mix showed a weak relationship with dialysis costs.
• Dialysis practices (membrane type, reuse, duration) significantly impacted costs.
• Hospital-based units incurred higher costs than freestanding units; payment constraints also increased costs.
• Large national dialysis chains demonstrated cost savings compared to independent facilities.

Conclusions:

• Adjusting dialysis payments for case mix is likely unnecessary for equitable reimbursement or access for high-cost patients.
• Increasing dialysis dose via longer treatments is more economical than using advanced membranes.
• Higher costs in hospital-based units may reflect overhead allocation rather than resource differences.
• Economies of scale in large chains may explain market share growth; continued monitoring of facility types and chain growth is recommended.