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Show all changes in ICD history relating to the 3-digit codes contained in a given vector icd
icd_showchanges_icd3(icd3)
data.frame with columns YEAR, ICD_CODE, ICD_LABEL and, if specified, DIAG_GROUP
Vector of three-digit ICD codes
icd_showchanges() if the input has been generated by icd_expand()
icd_showchanges()
icd_expand()
icd_showchanges_icd3("A09")
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