What is contribution margin, and how can it be used to analyze a hospital department?

• A. Contribution margin = total costs minus total revenue; used for break-even.
• B. Contribution margin = net income plus depreciation; used for cash flow.
• C. Contribution margin = revenue minus variable costs; helps assess the profitability of department-level activities and potential for fixed cost absorption.
• D. Contribution margin = fixed costs minus variable costs; used to determine department necessity.

Answer: (C)

Contribution margin is the revenue that remains after paying for variable costs. In a hospital department, variable costs change with patient volume (for example, supplies, medications, and the portion of direct labor tied to patient care), while fixed costs stay relatively constant in the short term. Subtracting variable costs from revenue shows how much money is available to cover fixed costs and contribute to profit. This is why contribution margin is useful for department-level analysis: it reveals whether a service line can absorb its fixed costs and still generate a gain, and it highlights which activities are most profitable at the current volume.

For example, if a department earns $5,000 per procedure and variable costs are $3,000, the contribution margin is $2,000 per procedure. If fixed costs total $400,000, about 200 procedures are needed to break even. Beyond that, each additional procedure adds $2,000 toward profit. This framework supports decisions about which services to emphasize, pricing, capacity planning, and whether to expand or discontinue services. Other formulations that use total costs or subtract variable from fixed costs don’t isolate the portion of revenue available to cover fixed costs after variable costs are paid, so they don’t convey the same decision-relevant insight.