Description Usage Arguments Details Value References See Also Examples
Function makes a dataframe that links ICD-9-CM codes to the Elixhauser comorbidity categories using the AHRQ v3.7 mapping.
1 | icd9cm_elixhauser_ahrq37(icd9)
|
icd9 |
a unique character vector of ICD-9-CM codes |
Uses regular expressions based on the file "comformat2012-2013.txt" from AHRQ.
The Agency for Healthcare Research and Quality (AHRQ) has developed Comorbidity Software as part of the Healthcare Cost and Utilization Project (HCUP). The software was developed to report on the comorbidity measures reported by Elixhauser (1998).
The AHRQ software has two parts, one that classifies ICD-9-CM codes by comorbidity, and another that performs heuristics to eliminate duplicate comorbidities and ignore comorbidities which are the primary reason for the hospital visit, as per the DRG.
This table is a translation of the first part of the software, the
classifier, as implemented in the SAS file Comformat2012-2013.txt
.
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"
.
A data frame, with ICD9 codes as row names and one logical column for each
comorbidity in elixhauser_list
1. http://www.hcup-us.ahrq.gov/toolssoftware/comorbidity/comorbidity.jsp
icd9cm_charlson_deyo
, icd9cm_charlson_romano
,
icd9cm_charlson_quan
, icd9cm_elixhauser_quan
1 2 3 4 5 6 7 8 9 10 11 | # 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_ahrq37(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)) })
|
id chf arrhythmia valve pulmcirc perivasc htn htncx para neuro chrnlung
1 1 FALSE FALSE FALSE FALSE TRUE FALSE FALSE FALSE FALSE FALSE
2 2 TRUE FALSE FALSE FALSE FALSE FALSE TRUE FALSE FALSE TRUE
dm dmcx hypothy renlfail liver ulcer aids lymph mets tumor rheum coag
1 FALSE FALSE FALSE FALSE FALSE FALSE FALSE TRUE FALSE FALSE FALSE FALSE
2 FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
obese wghtloss lytes bldloss anemdef alcohol drug psych depress
1 FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
2 FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
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