2007 ICD-9-CM Procedure 20.91 Tympanosympathectomy 20.91 is a specific code that can be used to specify a procedure 20.91 contains 3 index entries View the full Volume 3 20.* hierarchy Index entries containing 20.91: Neurectomy (cranial) (infraorbital) (occipital) (peripheral) (spinal) NEC 04.07 tympanic 20.91 Sympathectomy NEC 05.29 tympanum 20.91 Tympanosympathectomy 20.91