Casemix is a tool to classify varieties of patient conditions into groups according to resources consumed as approximated by length of stay, episode cost, or cost of daily services'. Diagnosis related group (DRG) is the first casemix that has been used as payment tool in the US prospective payment system (PPS) for acute inpatient services since 1983. Thailand has adopted DRG for inpatient care payment within a global budget of the universal coverage scheme since 2003. Conceptually, the DRG classification has been developed based on acute health conditions, it is therefore inappropriate to use DRG for a payment system for sub-acute and non-acute health problems because of different clinical problems, mode of care and resource uses). Instead of being a short episode of  care such as short stay for an operation or acute treatment, sub-acute and non-acute services are most often time-consuming for restoring functional status of the patients. Functional status is both very important for monitoring and for evaluating quality of sub-acute and non-acute care. Thus, casemix of sub-acute and non-acute services has been developed and implemented in many countries.

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