2007 ICD-9-CM Procedure 07.91 Exploration of thymus field 07.91 is a specific code that can be used to specify a procedure 07.91 contains 1 index entry View the full Volume 3 07.* hierarchy 07.91 excludes: exploration with incision of thymus (07.92) Index entries containing 07.91: Exploration -- see also Incision thymus (gland) 07.92 field 07.91