2007 ICD-9-CM Procedure 49.51 Left lateral anal sphincterotomy 49.51 is a specific code that can be used to specify a procedure 49.51 contains 2 index entries View the full Volume 3 49.* hierarchy Index entries containing 49.51: Division sphincter anal (external) (internal) 49.59 left lateral 49.51 Sphincterotomy anal (external) (internal) 49.59 left lateral 49.51