N31 vs O08.8

N31 (Neuromuscular dysfunction of bladder, not elsewhere classified) compared with O08.8 (Other complications following an ectopic and molar pregnancy), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. N31 carries an Excludes2 note covering O08.8: “abortion or ectopic or molar pregnancy (O00-O07, O08.8)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

	N31Neuromuscular dysfunction of bladder, not elsewhere classified	O08.8Other complications following an ectopic and molar pregnancy
Billing status	Non-billable header Report instead: N31.0, N31.1, N31.2, N31.8, N31.9	Non-billable header Report instead: O08.81, O08.82, O08.83, O08.89
Classification	N00-N99 — Diseases of the Genitourinary System (N00-N99)	O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)
Definition	Neuromuscular dysfunction of bladder, not elsewhere classified is a non-billable ICD-10-CM category code (N31).	Other complications following an ectopic and molar pregnancy is a non-billable ICD-10-CM category code (O08.8).
Use additional code	code to identify any associated urinary incontinence (N39.3-N39.4-)	—

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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