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What does SI-IS stand for?

SI-IS stands for Severity of Illness-Intensity of Service

This definition appears very rarely

Samples in periodicals archive:

InterQual published its first severity of illness/intensity of service criteria in 1978 for evaluating appropriateness of admissions and level of service. Later, the company added discharge screens when it realized that hospitals also needed guidance in determining when patients were well enough to go home.
Now is the time for healthcare facilities to merge meaningful use and ICD-10-CM/PCS planning initiatives and develop templates, prompts, and overall systems that facilitate and encourage documentation needed for patient care, severity of illness, intensity of services.