melt_icd9list: Convert ICD-9-CM code list to dataframe
In medicalrisk: Medical Risk and Comorbidity Tools for ICD-9-CM Data

Description Usage Arguments Value Examples

melt_icd9list uses ddply to melt a column of comma-separated ICD-9-CM codes into a series of rows, one for each code.

melt_icd9list(
  df,
  idvar = "id",
  icd9var = "icd9cm",
  .progress = "none",
  .parallel = FALSE,
  .paropts = NULL
)

`df`	a data frame with at least two columns, specified as `idvar` and `icd9var`.
`idvar`	string with name of ID variable within `df` (defaults to "id")
`icd9var`	string with name of ICD code variable within `df` (defaults to "icd9cm")
`.progress`	passed to `ddply`
`.parallel`	passed to `ddply`
`.paropts`	passed to `ddply`

a dataframe with two columns, idvar and "icd9cm"

cases <- data.frame(id=c(1,2),
    icd9list=c('162.4,070.30,155.0,401.9','996.52,E878.8,V45.86'),
    stringsAsFactors=TRUE)
melt_icd9list(cases, "id", "icd9list")