%i9d% operator, so cannot be
  done as an R file in the data directory. The data is documented in
  datadocs.R.
parseElix(condense = FALSE, save = FALSE, path = "data")FALSE so that the saved list will allow rapid look-up of codes
without further processing. Small memory versus time trade-off.FALSE."~/icd9/data".
Could possibly avoid hard-coding path with devtools functions.