2007 ICD-9-CM Procedure 20.23 Incision of middle ear 20.23 is a specific code that can be used to specify a procedure 20.23 contains 10 index entries View the full Volume 3 20.* hierarchy 20.23 also known as: Atticotomy Division of tympanum Lysis of adhesions of middle ear 20.23 excludes: division of otosclerotic process (19.0) stapediolysis (19.0) that with stapedectomy (19.11-19.19) Index entries containing 20.23: Adhesiolysis -- see also Lysis, adhesions middle ear 20.23 Atticotomy (ear) 20.23 Division tympanum 20.23 Exploration -- see also Incision middle ear (transtympanic) 20.23 tympanum 20.09 transtympanic route 20.23 Hypotympanotomy 20.23 Incision (and drainage) ear middle 20.23 Lysis adhesions ear, middle 20.23 middle ear 20.23 Plicotomy, tympanum 20.23