spawnReferenceChildren

take a regular string of an ICD9 code of format (ABC.zxyz) with or without
leading and trailing zeroes. top level ICD9 code and return T/F if the icd9
fall within subgroups. This takes several seconds on an unimpressive desktop
PC, so would benefit from memoization.

internal

This package allows accurate manipulation, validation and
    comparison of ICD-9-CM (clinical modification) codes. Although ICD-9 codes
    appear numeric, this is not the case, since trailing zeroes, and a mixture
    of decimal and non-decimal "short" format codes exist. Tools to map ICD-9
    codes to co-morbidities are also provided, with mappings from Quan (Deyo
    and Elixhauser versions), Elixhauser and AHRQ included.

spawnReferenceChildren: spawn reference codes into all possible lower-level codes (and memoise)

Description

Usage

Arguments