elixhauser: Produces an Elixhauser comorbidity count

In gforge/comorbidities.icd10: Calculates Comorbidity Indices Based on ICD-9/10

Description

This function take as input a data frame structured such that each row contains a list of ICD-9-CM codes attributed to a single patient. The function goes from row to row comparing the ICD-9-CM codes a patient has with the Elixhauser comorbidity index diagnosis codes. If a patient has a diagnosis (as indicated by ICD-9-CM code) that belongs to one of the Elixhauser diagnoses, then the patient is considered to have this diagnosis. Regardless of how many different ICD-9-CM codes a patient has corresponding to a particular comorbidity category, a comorbidity is only counted once.

Usage

elixhauser(input.frame)

Arguments

input.frame

This is a data frame with 5 character ICD-9-CM codes without decimal points

Details

The value returned consists of a vector and a data frames. The vector is the total comorbidity count. In the data frame returned each row in the data frame is devoted to a particular patient, and each column is a diagnosis. The data frame codes a 0 if the patient does not have that diagnosis and 1 if the patient does have that diagnosis.

The ICD-9-CM codes must be 5 characters long and have no decimal poinst.If any codes are less than 5 digits, then they must be led by zeroes or followed by the letter "X" to create a 5 character code. No more than 2 "X" ' s can be used at the tail end, or a meaningful ICD-9-CM code cannot be derived. If your ICD-9-CM codes contain decimals or some other filler character, then they must be converted to the format above for this function to work properly.

Value

A list of one vector and one data frames

COMORBIDITY.CT	A vector containing the number of comorbidtities for each patient
COMORBIDITIES	A data frame denoting which diagnoses each patient has with a 1

Warning

This function is deprecated. We recommend you switch to the more general cmrbdt.calc function instead.

Author(s)

Paul Gerrard, Max Gordon

References

Elixhauser A, Steiner C, Harris DR, Coffey RM. (1998) Comorbidity measures for use with administrative data. Med Care. 36:8-27.

Examples

x <- matrix(NA, nrow = 3, ncol = 2)
x[1,] <- c("41000", "42800")
x[2,] <- c("57220", "1961X")
x[3,1] <- "042XX"
x <- as.data.frame(x)
elixhauser(x)

gforge/comorbidities.icd10 documentation built on May 17, 2019, 2:12 a.m.