G83.4 vs N31
G83.4 (Cauda equina syndrome) compared with N31 (Neuromuscular dysfunction of bladder, not elsewhere classified), 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. N31 carries an Excludes1 note covering G83.4: “neurogenic bladder due to cauda equina syndrome (G83.4)”
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
| G83.4Cauda equina syndrome | N31Neuromuscular dysfunction of bladder, not elsewhere classified | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Cauda equina syndrome is a billable ICD-10-CM diagnosis code (G83.4). | Neuromuscular dysfunction of bladder, not elsewhere classified is a non-billable ICD-10-CM category code (N31). |
| Includes | paralysis (complete) (incomplete), except as in G80-G82 Neurogenic bladder due to cauda equina syndrome | — |
| Use additional code | — | code to identify any associated urinary incontinence (N39.3-N39.4-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources