N91.5 vs N92.6
N91.5 and N92.6 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on N92.6
lengthened intervals or scanty bleeding (N91.3-N91.5)
N91.5
Oligomenorrhea, unspecified
BillableUnspecified
- Chapter 14
- Diseases of the genitourinary system
- Section
- N80-N98
Use when the record says
- Hypomenorrhea NOS
Indexed under
- Oligomenorrhea
N92.6
Irregular menstruation, unspecified
BillableUnspecified
- Chapter 14
- Diseases of the genitourinary system
- Section
- N80-N98
Use when the record says
- Irregular bleeding NOS
- Irregular periods NOS
Indexed under
- Paramenia
- Bleeding › irregular
- Cycle › menstrual, irregular
- Disorder › menstrual (of)
- Irregular, irregularity › bleeding
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027