icd9cm_elixhauser_quan {medicalrisk} | R Documentation |
Create Quan map of ICD-9-CM to Elixhauser comorbidities
Description
Function to make a dataframe that links ICD-9-CM codes to the Elixhauser comorbidity categories using the Quan mapping.
Usage
icd9cm_elixhauser_quan(icd9)
Arguments
icd9 |
a unique character vector of ICD-9-CM codes |
Details
Uses regular expressions created from the Quan paper from 2005.
ICD-9-CM codes must have periods removed. Diagnostic codes are prefixed with
'D' while procedure codes are prefixed with 'P'. So, diagnostic code
404.03
should be "D40403"
.
Some ICD-9-CM codes will correspond to more than one category. For example,
404.03
(Hypertensive heart and chronic kidney disease ... stage V) is
in both chf
and renlfail
categories.
Value
A data frame, with ICD9 codes as row names and one logical column for each
comorbidity in elixhauser_list
References
1. Quan H, Sundararajan V, Halfon P, Fong A, Burnand B, Luthi J-C, Saunders LD, Beck CA, Feasby TE, Ghali WA: Coding algorithms for defining comorbidities in ICD-9-CM and ICD-10 administrative data. Medical care 2005; 43:1130-9 http://www.ncbi.nlm.nih.gov/pubmed/16224307
See Also
icd9cm_charlson_deyo
, icd9cm_charlson_romano
,
icd9cm_charlson_quan
, icd9cm_elixhauser_ahrq37
Examples
# Identify Elixhauser categories
cases <- data.frame(id=c(1,1,1,2,2,2),
icd9cm=c("D20206","D24220","D4439","D5064","DE8788","D40403"),
stringsAsFactors=TRUE)
cases_with_cm <- merge(cases, icd9cm_elixhauser_quan(levels(cases$icd9cm)),
by.x="icd9cm", by.y="row.names", all.x=TRUE)
# generate crude comorbidity summary for each patient
library(plyr)
ddply(cases_with_cm, .(id),
function(x) { data.frame(lapply(x[,3:ncol(x)], any)) })