ICD-10-CM · Chapter 14 · N00-N99
N91 Absent, scanty and rare menstruation
Excludes 1 (cannot be coded together)
- ovarian dysfunction (E28.-)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| N91..0 | Primary amenorrhea | Yes |
| N91..1 | Secondary amenorrhea | Yes |
| N91..2 | Amenorrhea, unspecified | Yes |
| N91..3 | Primary oligomenorrhea | Yes |
| N91..4 | Secondary oligomenorrhea | Yes |
| N91..5 | Oligomenorrhea, unspecified | Yes |
Last reviewed: September 2026