The encyclopedia · Finance & Accounting · Financial decision · 1983–1985
Medicare replaced blank-check hospital pay with fixed per-case DRG prices in 1983
From October 1983, Medicare paid a fixed price per diagnosis group instead of whatever the hospital spent, flipping the incentive toward costing less.
Medicare · US hospitals
the move
From 1966 to 1983, Medicare paid hospitals their reasonable costs for whatever inpatient care they delivered; a patient's diagnosis did not affect the amount. Because no incentive existed to contain costs, Medicare spending kept escalating and threatened the program's finances.
The 1983 Social Security Amendments (Public Law 98-21), enacted April 20, created a prospective payment system based on diagnosis-related groups developed at Yale. From October 1, 1983, each discharge was classified into a DRG and paid at a fixed rate, with extra payments only for outlier cases.
The design transferred the risk of cost overruns to hospitals: treat a case for less than the DRG price and keep the difference. Pressure to shorten stays and shift care to outpatient settings followed, and other payers began copying the method.
why it works
- A fixed price per case turns cost containment into the hospital's own problem, not a regulator's campaign.
- DRGs group clinically similar cases with similar resource use, so prices can be set fairly without inspecting every bill.
- Hospitals learned to code and manage to the price, which is why the payer must recalibrate weights as behavior and technology change.
what transfers
Reimbursing inputs buys inputs; pricing the output flips the incentive. The payer must keep re-weighting the categories, because once price follows the label, providers start gaming the label.
what came after
By 1985 the share of discharges assigned to different DRGs had shifted as hospitals responded to the new incentives, and state Medicaid programs and insurers considered adopting the same approach. DRG-style payment became the foundation of later Medicare reforms, from outpatient payment to bundled episodes and readmission penalties.
references
- Medicare: Short-stay hospital services, by leading diagnosis-related groups, 1983 and 1985
- The Medicare prospective payment system
spotted an error? The archive wants to know.