2007 ICD-9-CM Procedure 90.9 Microscopic examination of specimen from lower gastrointestinal tract and of stool 90.9 is a non-specific code that should not be used to specify a procedure 90.9 contains 10 index entries View the full Volume 3 90.* hierarchy Index entries containing 90.9: Examination (for) microscopic (specimen) (of) 91.9 anus 90.9 appendix 90.9 colon 90.9 ileum 90.9 jejunum 90.9 large intestine 90.9 rectum 90.9 sigmoid 90.9 small intestine 90.9 stool 90.9