N91 – Absent, scanty and rare menstruation
ICD-10-CM 2027 diagnosis code · Noninflammatory disorders of female genital tract
ICD-10-CM code
N91
- Code
N91(claims format:N91)- Description
- Absent, scanty and rare menstruation
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 14. Diseases of the genitourinary system (N00-N99)
- Block
- N80-N98 Noninflammatory disorders of female genital tract
Billable codes under N91
N91 is a header code and cannot be used on claims. Choose the most specific code:
- N91.0 – Primary amenorrheaBillable
- N91.1 – Secondary amenorrheaBillable
- N91.2 – Amenorrhea, unspecifiedBillable
- N91.3 – Primary oligomenorrheaBillable
- N91.4 – Secondary oligomenorrheaBillable
- N91.5 – Oligomenorrhea, unspecifiedBillable
Notes for N91
Excludes1 (not coded here):
- ovarian dysfunction (E28.-)
Frequently asked questions
What is ICD-10 code N91?
N91 is the ICD-10-CM code for absent, scanty and rare menstruation, in the block N80-N98 (Noninflammatory disorders of female genital tract).
Is N91 a billable code?
No. N91 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.