Character vector of length one: the version of ICD-10-CM to use,
corresponding to the suffix of the data.frame name, e.g., for 2019
ICD-10-CM, use "icd10cm2019" for Dutch 2014 ICD-CM translations, use
"icd10cm2014_nl"
check_exists
TRUE by default, which forces a check that the
requested version is actually available in this R session.