N31 vs N33
N31 (Neuromuscular dysfunction of bladder, not elsewhere classified) compared with N33 (Bladder disorders in diseases classified elsewhere), 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. N33 carries an Excludes1 note covering N31: “cystitis in neurogenic bladder (N31.-)”
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
| N31Neuromuscular dysfunction of bladder, not elsewhere classified | N33Bladder disorders in diseases classified elsewhere | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | N00-N99 — Diseases of the Genitourinary System (N00-N99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Neuromuscular dysfunction of bladder, not elsewhere classified is a non-billable ICD-10-CM category code (N31). | Bladder disorders in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (N33). |
| Use additional code | code to identify any associated urinary incontinence (N39.3-N39.4-) | — |
| Code first | — | underlying disease, such as: schistosomiasis (B65.0-B65.9) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources