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icd9 (version 1.3.1)

icd9GetMajor: Get major (three-digit) part of ICD-9 codes

Description

This is reasonably fast, but calculates all the minors, then throws away the result.

Usage

icd9GetMajor(icd9, isShort)
icd9GetMajorShort(icd9Short)

Arguments

icd9
is a character vector or factor of ICD-9 codes. If fewer than five characters is given in a code, then the digits are greedily assigned to hundreds, then tens, then units, before the decimal parts. E.g. "10" becomes "010", not "0010".
isShort
single logical value which determines whether the ICD-9 code provided is in short (TRUE) or decimal (FALSE) form. Where reasonable, this is guessed from the input data.