#' @param defined single logical value, if \code{TRUE}, will limit the search to
#' those codes which appear in the official list, not just syntactically valid
#' codes. Since nearly valid, out-dated or new codes may be missed, not
#' limiting to officially defined values will be useful. Ultimately, there
#' will need to be annual (and all-time) official lists of codes and the
#' ability to test against a list for the year of the ICD-9 coding.
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