N91: Absent, scanty and rare menstruation excludes1 ovarian dysfunction (E28.-) |
| N91.0: Primary amenorrhea |
| N91.1: Secondary amenorrhea |
| N91.2: Amenorrhea, unspecified |
| N91.3: Primary oligomenorrhea |
| N91.4: Secondary oligomenorrhea |
| N91.5: Oligomenorrhea, unspecified |