Mortality Measurement

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Development of the 3M™ APR DRGs

Combination Type	Combination of Categories	Additional Secondary Diagnoses Required	Minimum Severity of Illness
1	Specified combinations of two major categories	At least two additional secondary diagnoses of major or higher	Extreme (4)
2	Specified combinations of a major and moderate category	At least two additional secondary diagnoses of major or higher	Extreme (4)
3	Specified combinations of two moderate categories	At least two additional secondary diagnoses of moderate or higher	Major (3)
4	Specified combinations of a moderate and minor category	At least two additional secondary diagnoses of moderate or higher	Major (3)
5	Specified combinations of two minor categories	At least two additional secondary diagnoses of minor or higher	Moderate (2)
6	Specified combinations of two moderate categories	None	Major (3)
11	Specified combinations of two major categories	At least one additional secondary diagnosis of major	Extreme (4)
13	Specified combinations of two moderate categories	At least one additional secondary diagnosis of moderate	Major (3)
15	Specified combinations of two minor categories	At least one additional secondary diagnosis of minor	Moderate (2)