ICD-10 Codes for Amenorrhea
The primary ICD-10 code for amenorrhea is N91.2 for secondary amenorrhea, while primary amenorrhea is coded as N91.0.
Primary Diagnostic Codes for Amenorrhea
- N91.0 - Primary amenorrhea (absence of menarche by age 15)
- N91.1 - Secondary amenorrhea (absence of menses for 3 consecutive cycles or 6 months)
- N91.2 - Amenorrhea, unspecified
- N91.4 - Oligomenorrhea, unspecified (infrequent menstruation)
Secondary Diagnostic Codes Based on Etiology
When coding amenorrhea, it's important to identify the underlying cause when possible:
- E23.0 - Hypopituitarism (if amenorrhea is due to pituitary dysfunction)
- E28.2 - Polycystic ovarian syndrome
- E28.3 - Primary ovarian insufficiency
- E34.3 - Short stature (if related to Turner syndrome)
- N97.0 - Female infertility associated with anovulation
- Z78.0 - Asymptomatic menopausal state
Coding for Functional Hypothalamic Amenorrhea
For amenorrhea related to energy deficiency, exercise, or stress:
- N91.1 - Secondary amenorrhea (primary code)
- E23.3 - Hypothalamic dysfunction, not elsewhere classified (secondary code)
- R63.4 - Abnormal weight loss (if applicable)
- F50.8 - Other eating disorders (if disordered eating is present)
Important Coding Considerations
Always code to the highest level of specificity available based on the documented diagnosis.
Include the underlying cause when known (e.g., PCOS, hyperprolactinemia, hypothalamic amenorrhea).
For lactational amenorrhea, use:
- O92.7 - Other and unspecified disorders of lactation
For pregnancy-related amenorrhea:
- Z33.1 - Pregnant state, incidental
Clinical Documentation Requirements
To support proper coding, documentation should include:
- Duration of amenorrhea
- Whether primary or secondary
- Results of diagnostic workup (hormone levels, imaging)
- Underlying etiology when identified
- Treatment plan
Proper coding ensures appropriate reimbursement and accurate tracking of this condition for population health management 1.