Abdominal Mass Biopsy. ... This includes a biopsy of an abdominal or retroperitoneal mass. ... Procedure preparation requirements are provided during scheduling. Oct 27, 2018 · Core needle biopsy goes to Excision because the larger bore needle “cuts” a core of tissue from the body part. Fine needle (aspiration) biopsy goes to Extraction because it removes tissue. These are the biopsies being referred to in the Q4 2017 Coding Clinic.