The ICD-10-PCS defines root operations excision and resection in a very similar way.
Excision is cutting out or off, without replacement, a portion of a body part. Coders should report the qualifier Diagnostic to identify excision procedures that are biopsies. Physicians use sharp instrument such as scalpel, wire, scissors, bone saw, and electrocautery tip during excision procedures.
Resection is very similar, except it includes all of a body part, or any subdivision of a body part that has its own body part value in ICD-10-PCS. ICD-10-PCS contains specific body parts for anatomical subdivisions of a body part, such as lobes of the lungs and regions of the intestine.
Coders will report Resection of the specific body part whenever all of the body part is cut out or off, rather than coding Excision of a less specific body part.
For example, the physician performs a left upper lung lobectomy. Coders would report a Resection of upper lung lobe, left, rather than Excision of lung, left.
In some situations, the physician may not be sure whether an entire body part is removed. For example, the physician may set out to remove an entire chain of lymph nodes. Because so many nodes are part of the chain, the physician may not be sure whether all were removed and may document that in the record. The coder must determine whether to code a resection (all of the nodes removed) or excision (some of the nodes removed). In this case, because the physician intended to remove all of the lymph nodes, the coder would report a resection.