icd9 (version 0.2.1)

icd9ExpandRangeShort: take two ICD-9 codes and expand range to include all child codes

Description

this is cumbersome code, covering a whole load of edge cases relating to the fact that icd9 codes are not in numeric order. An alternative strategy would be to list all the ICD9 codes, then a range would just pick out start and finish positions, and return subset of the list. Not all ICD-9 codes are valid, including some parent codes which have valid children. However, I expect at least some of these have been used in some billing databases.

Usage

icd9ExpandRangeShort(start, end, invalidAction = c("ignore", "silent", "warn",
  "stop"))
start %i9s% end

Arguments

start,end

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"

invalidAction

character string (unit length) containing one of: "ignore", "silent", "warn", "stop"

- ignore no check for validity of ICD-9 code is made implicitly. This is the fastest option. If the function call is explicitly to check validity, e

See Also

Other ICD-9 ranges: %i9d%, icd9ExpandRangeDecimal; %i9mj%; icd9ChildrenDecimal; icd9Children, icd9ChildrenShort; icd9CondenseShort; icd9CondenseToExplainShort; icd9ExpandMinor, icd9ExpandMinorE, icd9ExpandMinorNV; icd9PrecedingMinors, icd9SubsequentMinors

Examples

"4280 " %i9s% "4289 "
"V80 " %i9s% "V8210 "

# the following should give all codes in 428 EXCEPT "428",
# and all codes upto 43014 EXCEPT 430 and 4301
icd9ExpandRangeShort("4280 ", "43014")