Which statements about the Medicare IPPS (hospital inpatient payment system) are most correct?

Which statements about the Medicare IPPS (hospital inpatient payment system) are most correct?

• A. The basis for payment is DRG.
• B. The DRG payment is adjusted for severity.
• C. Payments are increased for very high costs (outliers).
• D. All of the above are correct.

Answer: (D)

In Medicare’s inpatient prospective payment system, payments are built around DRGs. Each hospital admission is classified into a DRG that groups patients with similar diagnoses and expected resource use, and the payment is set by applying a DRG weight to a base payment rate. Over time, these DRGs have been refined to reflect severity of illness and comorbidity—so weights are adjusted for how sick the patient is, using severity-adjusted DRGs (MS-DRGs) to better align payment with actual resource use. There is also an outlier mechanism: when a case incurs exceptionally high costs beyond a threshold, the hospital receives additional outlier payments to help cover those extraordinary expenses. Taken together, these features describe the Medicare IPPS approach, making all of the statements correct.

In Medicare’s inpatient prospective payment system, payments are built around DRGs. Each hospital admission is classified into a DRG that groups patients with similar diagnoses and expected resource use, and the payment is set by applying a DRG weight to a base payment rate. Over time, these DRGs have been refined to reflect severity of illness and comorbidity—so weights are adjusted for how sick the patient is, using severity-adjusted DRGs (MS-DRGs) to better align payment with actual resource use. There is also an outlier mechanism: when a case incurs exceptionally high costs beyond a threshold, the hospital receives additional outlier payments to help cover those extraordinary expenses. Taken together, these features describe the Medicare IPPS approach, making all of the statements correct.