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Compare/E28 vs N91

E28 vs N91

E28 (Ovarian dysfunction) compared with N91 (Absent, scanty and rare menstruation), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Can these codes be reported together?

No — do not report together. N91 carries an Excludes1 note covering E28: “ovarian dysfunction (E28.-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

E28Ovarian dysfunctionN91Absent, scanty and rare menstruation
Billing statusNon-billable header

Report instead: E28.0, E28.1, E28.2, E28.310, E28.319

Non-billable header

Report instead: N91.0, N91.1, N91.2, N91.3, N91.4

ClassificationE00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89)N00-N99 — Diseases of the Genitourinary System (N00-N99)
DefinitionOvarian dysfunction is a non-billable ICD-10-CM category code (E28).Absent, scanty and rare menstruation is a non-billable ICD-10-CM category code (N91).
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources