Diagnosis-Related Group (DRG)
A Diagnosis-Related Group (DRG) is a patient-classification system that bundles inpatient stays with similar diagnoses, procedures, and resource use into a single payment category. Medicare and other payers reimburse a fixed amount per DRG, incentivizing efficient inpatient care.
What is a Diagnosis-Related Group (DRG)?
A Diagnosis-Related Group (DRG) is a classification system that sorts inpatient hospital stays into categories that share similar diagnoses, procedures, and expected use of resources. Each category is designed to group together cases that should cost roughly the same to treat.
Under this model, a payer reimburses a fixed, predetermined amount for the assigned group rather than itemizing every service. Medicare introduced the approach for inpatient payment, and many other payers have adopted variations of it.
Why does the DRG model matter?
Because payment is fixed per group, the DRG system shifts financial risk toward providers and rewards efficient, well-coordinated inpatient care. If a stay costs less than the set amount, the facility benefits; if it costs more, the facility absorbs the difference.
DRGs are an inpatient construct, so they generally do not govern ambulatory surgery center payment, which usually follows outpatient methodologies such as ambulatory payment classifications. Still, understanding DRGs is useful context for revenue-cycle teams that work across both inpatient and outpatient settings.
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