A patient whose length of stay or treatment cost differs substantially from the stays or costs of most other patients in a diagnosis related group. Under DRG reimbursement, outliers are given exceptional treatment subject to peer review and organization review.
A node whose exclusion from its containing peer group would significantly improve the accuracy and simplicity of the aggregation of the remainder of the peer group topology.
Departure from an average, usually defined as at least two standard deviations from the mean; a hospital admission requiring either substantially more expense or a much longer length of stay than is typical for patients with a given condition or illness. Under Diagnosis-Related Group payment, patients who are outliers are given exceptional treatment subject to peer review and organization review.