SOI is most frequently used in conjunction with the APR-DRG system (a variant of diagnosis-related group) which has been developed by 3M. Patients within the are assigned their SOI based on their specific diagnoses and procedures performed during their medical encounter, which is generally an inpatient hospital stay. Patients with higher SOI (e.g. major or extreme) are more likely to consume greater healthcare resources and stay longer in hospitals than patients with lower SOI in the same APR-DRG.
The Centers for Medicare and Medicaid Services, also known as CMS, considered the APR-DRG and SOI system as a potential evolution to the DRG system in 2006, but in March 2007 decided to adopt another internally developed system evolved from the [Diagnosis-related group] DRG SOI is still commonly used throughout the United States to adjust for patient complexity, so that physicians and other groups can compare resource utilization, complication rates, and length of stay.
3M APR DRG Software
RAND Evaluation of DRG Systems
Severity of illness: red herring or horse of different color? (part 3) (the use of severity-of-illness measures to assess performance of health care providers)
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