Systems, methods, and computer-readable media are provided for patient case and care complexity characterization, and detecting matches of an individual patient's
record with collections of other patients' records, based on serial, longitudinal patterns, for facilitating efficient
health services utilization, implementing programs to reduce complexity, preventive
medicine, and risk management in health care. In an embodiment,
time series are formed by electronically representing information pertaining to successive longitudinal episodes of
health services utilization and the circumstances in which the episodes were incurred; calculating time-series K-nearest-neighbor clusters and distances for each combination; determining the cluster to which a given candidate patient complexity
record is nearest, and prescribing one or more interventions specific to the plurality of hazards that are characteristic of trajectories that are members of that cluster, or that are deemed to be relevant to mitigating those hazards, thereby preventing the
adverse outcomes and subsequent excess utilization that are prevalent in that cluster.