2007 ICD-9-CM Procedure 46.91 Myotomy of sigmoid colon 46.91 is a specific code that can be used to specify a procedure 46.91 contains 3 index entries View the full Volume 3 46.* hierarchy Index entries containing 46.91: Myotomy 83.02 colon NEC 46.92 sigmoid 46.91 sigmoid (colon) 46.91 Sigmoidomyotomy 46.91