icd9_chapters_to_map

Either a chapter list itself, or the name of one, e.g.
<code>icd9_sub_chapters</code>

Single logical value, if <code>TRUE</code>, the default, only
officially defined ICD-9 (currently ICD-9-CM) codes will be used in the
expansion, not any syntactically possible ICD-9 code.

defined

the chapter headings can be converted into the full set of their children,
and then used to look-up which chapter, sub-chapter, or 'major' a given code
belongs. Always returns a map with short-form ICD-9 codes. These can be
converted in bulk with <code>lapply</code> and <code>short_to_decimal</code>.

manip

internal

Calculate comorbidities, Charlson and van Walraven
scores, perform fast and accurate validation, conversion,
manipulation, filtering and comparison of ICD-9 and ICD-10 codes. This
package enables a work flow from raw lists of ICD codes in hospital
databases to comorbidities.  ICD-9 and ICD-10 comorbidity mappings
from Quan (Deyo and Elixhauser versions), Elixhauser and AHRQ
included.  Common ambiguities and code formats are handled.

Jack O Wasey

icd9_chapters_to_map: convert the chapter headings to lists of codes

Description

Usage

Arguments