2007 ICD-9-CM Procedure 84.21 Thumb reattachment 84.21 is a specific code that can be used to specify a procedure 84.21 contains 4 index entries View the full Volume 3 84.* hierarchy Index entries containing 84.21: Reattachment extremity 84.29 fingers, except thumb 84.22 thumb 84.21 thumb 84.21 finger 84.22 thumb 84.21 thumb 84.21