Healthcare Economics, Payer Mix and Risk
This domain tests how payer composition, government rate-setting, and risk-bearing contracts shape margin. Expect calculations of weighted net revenue and questions about capitation, shared savings, risk adjustment, and cost shifting.
Payer mix economics
Net revenue per case varies widely across Medicare, Medicaid, commercial, and self-pay. Weighted net revenue per case equals the sum of each payer's share times its net revenue per case. Because fixed costs do not fall when mix worsens, margin is highly sensitive to small mix shifts.
Risk arrangements
Capitation pays a per-member-per-month rate and transfers utilization risk to the provider. Shared savings returns a portion of savings against a benchmark, often with downside risk in two-sided models. Bundles price an episode across settings. Risk adjustment models such as HCCs predict cost so sicker populations are funded adequately; without adjustment, plans face adverse selection. Medical loss ratio rules require a minimum share of premium spent on care.
Worked example
A system produces 20,000 cases. Mix: 40% Medicare at $9,000 net; 25% Medicaid at $7,000; 30% commercial at $14,000; 5% self-pay at $1,500. Weighted revenue = 0.40 times 9,000 + 0.25 times 7,000 + 0.30 times 14,000 + 0.05 times 1,500 = 3,600 + 1,750 + 4,200 + 75 = $9,625 per case, or $192.5 million. Shift five points from commercial to Medicaid: 3,600 + 2,100 + 3,500 + 75 = $9,275, a loss of $350 per case and $7.0 million annually. Offsetting requires lower cost per case or higher commercial rates.
Cost shifting and public programs
Providers offset Medicare and Medicaid underpayment with commercial rates where market power permits. DSH, UPL payments, and the 340B program soften the shortfall but do not eliminate it.
Traps that cost marks
- Using charges rather than net revenue in mix analysis.
- Comparing capitation revenue to fee-for-service revenue without normalizing utilization.
- Ignoring risk adjustment when evaluating Medicare Advantage or ACO populations.
- Assuming cost shifting is unlimited in competitive or transparent markets.