2007 ICD-9-CM Procedure 06.91 Division of thyroid isthmus 06.91 is a specific code that can be used to specify a procedure 06.91 contains 2 index entries View the full Volume 3 06.* hierarchy 06.91 also known as: Transection of thyroid isthmus Index entries containing 06.91: Division isthmus thyroid 06.91 Transection -- see also Division isthmus, thyroid 06.91