How are subterms used in ICD-9-CM codes?

In the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM), subterms are used to provide additional detail and specificity to the main code. They are typically used to identify the site or laterality of a condition, or to specify the type of procedure that was performed.

Subterms are always enclosed in parentheses and are placed after the main code. For example, the code for "fracture of shaft of humerus, left arm" is 812.11(L). The subterm "(L)" indicates that the fracture is located on the left arm.

Subterms can be used with any ICD-9-CM code, but they are most commonly used with codes for injuries, diseases, and surgical procedures. For example, the code for "burn of face and neck" is 944.20, and the subterm "(face and neck)" provides additional detail about the location of the burn.

Subterms are also used to identify the type of procedure that was performed. For example, the code for "appendectomy" is 47.0, and the subterm "(laparoscopic)" indicates that the procedure was performed using a laparoscope.

Subterms are an important part of ICD-9-CM coding, and they can help to ensure that the codes accurately reflect the patient's condition or procedure.