ICD-10-CM > N00-N99 > N80-N98 > N80 > N80.2 > N80.21 N80.21 Superficial endometriosis of fallopian tube Non-Billable/Non-Specific Codes N80.211Superficial endometriosis of right fallopian tubeN80.212Superficial endometriosis of left fallopian tubeN80.213Superficial endometriosis of bilateral fallopian tubesN80.219Superficial endometriosis of unspecified fallopian tube