The function icd_history takes the result of icd_expand,
specified for a particular year, and returns a data.frame
containing all corresponding codes for the specified years
(from 2003). To do this, it applies the ICD-10-GM transition
tables to map codes between successive ICD-10-GM versions.
Only automatic transitions are followed.
Arguments
- icd_expand
A data.frame (e.g. as generated by the function icd_expand)
- years
Years to historize (e.g. 2005:2014)
- custom_transitions
(Optional) A data.frame containing custom transitions to complement the official transitions provided by
icd_meta_transition.
Value
data.frame with columns YEAR, ICD_CODE, ICD_COMPRESSED, ICD_LABEL and, if specified, DIAG_GROUP
#' @seealso icd_expand() to generate the necessary input
Examples
# Between 2018 and 2019, causalgia (G56.4) was reclassified
# under G90 as a complex regional pain syndrome
icd_meta <- data.frame(ICD = "G56.4", ICD_LABEL = "Causalgia")
icd_meta_expanded <- icd_expand(icd_meta, year = 2018, col_meta = "ICD_LABEL")
icd_history(icd_meta_expanded, years = 2018:2019)
#> # A tibble: 2 × 8
#> icd_spec ICD_LABEL year icd3 icd_code icd_normcode icd_sub label
#> <chr> <chr> <int> <chr> <chr> <chr> <chr> <chr>
#> 1 G564 Causalgia 2018 G56 G56.4 G56.4 G564 Kausalgie
#> 2 G564 Causalgia 2019 G90 G90.60 G90.60 G9060 Komplexes region…