What is the icd9 code for tarry stool?

There is no specific ICD-9 code for tarry stool. However, the ICD-9 code for melena is 578.1, which is defined as "the passage of black, sticky stools due to the presence of altered blood." Tarry stools are a type of melena, so the ICD-9 code for tarry stools would be 578.1.