ICD-10-CM > N00-N99 > N80-N98 > N80 > N80.3 > N80.33 N80.33 Superficial endometriosis of the pelvic sidewall Non-Billable/Non-Specific Codes N80.331Superficial endometriosis of the right pelvic sidewallN80.332Superficial endometriosis of the left pelvic sidewallN80.333Superficial endometriosis of bilateral pelvic sidewallN80.339Superficial endometriosis of pelvic sidewall, unspecified side