FY2027
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Excludes1 pair

N91.5 vs N92.6

N91.5 and N92.6 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

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
  • 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