ICD-10-CM > N00-N99 > N80-N98 > N80 > N80.5 > N80.52 N80.52 Endometriosis of the sigmoid colon Non-Billable/Non-Specific Codes N80.521Superficial endometriosis of the sigmoid colonN80.522Deep endometriosis of the sigmoid colonN80.529Endometriosis of the sigmoid colon, unspecified depth