2007 ICD-9-CM Procedure 20.92 Revision of mastoidectomy 20.92 is a specific code that can be used to specify a procedure 20.92 contains 2 index entries View the full Volume 3 20.* hierarchy Index entries containing 20.92: Excision scar -- see also Excision, lesion, by site mastoid 20.92 Revision mastoidectomy 20.92