icd (version 2.2)

icd9_expand_range_worker: expand range worker

Description

Expands a range of short ICD-9 codes, dropping ambiguous codes in the middle of ranges

Usage

icd9_expand_range_worker(start, end, lookup, defined, ex_ambig_start,
  ex_ambig_end)

Ambiguous terminal parent codes

At the end of the output, we may not want any higher-level codes at the end which would have children beyond the specified range. There could be lots of lower level codes at the end, so we actually have to search the whole list to be sure. One parent code could have maximum of 110 child codes, so we just search the last 110 (TODO). This means that even if trying to preserve the ambiguous start, setting ex_ambig_end will have to kill it, if it spills over.

Ambiguous starting parent codes

Excluding ambiguous parent codes from the start is easier than those near the end of the result. Just remove those codes at the beginning which have children not in the output let us take the first 5, to cover cases like 100, 101, 102.1, 102.11, 102.2. There are only so many ways for parent codes to appear (assuming the input vector is ordered)

Examples

# NOT RUN {
microbenchmark::microbenchmark(
  icd9_expand_range_worker_alt_base("100", "114", icd9_short_n, TRUE, TRUE, TRUE),
  icd9_expand_range_worker("100", "114", icd9_short_n, TRUE, TRUE, TRUE),
  times = 5
)
# }