Absent, scanty and rare menstruation (N91)
The ICD-10 codes N91 cover conditions involving absent, scanty, or infrequent menstruation. These codes specifically identify types of amenorrhea and oligomenorrhea, helping healthcare providers classify menstrual disorders accurately.
The ICD-10 code for absent menstruation includes N91.0 for primary amenorrhea, which refers to delayed or absent first menstrual periods, also known as physiologic or primary physiologic amenorrhea. N91.1 represents secondary amenorrhea, describing the loss of menstruation after it has previously occurred; this may be linked to several causes such as pituitary dysfunction, exercise-related amenorrhea, or lactational amenorrhea. When the cause is unclear, N91.2 is used for unspecified amenorrhea. Infrequent or scanty menstruation is classified under N91.3 and N91.4 for primary and secondary oligomenorrhea respectively, with N91.5 addressing unspecified cases. These codes aid medical coders and clinicians in accurately documenting menstrual irregularities, ensuring proper diagnosis and treatment planning.
Instructional Notations
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- ovarian dysfunction E28
Clinical Terms
The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.
Amenorrhea
Absence of menstruation.
Oligomenorrhea
Abnormally infrequent menstruation.
