Quickly find V or E codes, without any validation.
icd9IsV(icd9)icd9IsE(icd9)
icd9IsVE(icd9)
icd9IsN(icd9)
is a character vector of ICD-9 codes. If fewer than five characters is given in a code, then the digits are greedily assigned to hundreds, then tens, then units, before the decimal parts. E.g. "10" becomes "010", not "0010"