# icd9Sort: sort short-form icd9 codes In icd9: Tools for Working with ICD-9 Codes, and Finding Comorbidities

## Description

Sorts lists of numeric only, V or E codes. Note that a simple numeric sort does not work for ICD-9 codes, since "162" > "1620", and also V codes precede E codes.

## Usage

 ```1 2 3 4 5``` ```icd9Sort(icd9, isShort = icd9GuessIsShort(icd9)) icd9SortShort(icd9Short) icd9SortDecimal(icd9Decimal) ```

## 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. `icd9Short` is a character vector 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" `icd9Decimal` character vector 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"

## Details

Implementation used fast built-in sort, then shuffles the E codes to the end.

## Value

sorted vector of ICD-9 codes. Numeric, then E codes, then V codes.

icd9 documentation built on May 30, 2017, 2:25 a.m.