This field contains a value, calculated to four decimal places, that combines administrative (coverage) grossing (the value contained in data item gross_a) and clinical grossing. Clinical grossing compensates for the under counting of diagnoses or operations that occurs where cases contain a not known diagnosis code.

The diagnostic data in a predefined group is analysed to ascertain the proportion of records that do not have a valid primary diagnosis. This shortfall in diagnostic coding is used to calculate a compensating factor. The clinical factor is multiplied by the value in gross_a to produce the combined grossing factor, gross_b.

The default value for this field is 1.0000. It is overwritten when clinical grossing is selected.

nn.nnnn = Combined grossing factor