G83.4 vs N31
G83.4 and N31 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on N31
neurogenic bladder due to cauda equina syndrome (G83.4)
G83.4
Cauda equina syndrome
Billable
- Chapter 6
- Diseases of the nervous system
- Section
- G80-G83
Use when the record says
- Neurogenic bladder due to cauda equina syndrome
Indexed under
- Compression › cauda equina
- Lesion › cauda equina (s) (nontraumatic)
- Syndrome › cauda equina
- Neurogenic › bladder › cauda equina syndrome
- Syndrome › compression › cauda equina
N31
Neuromuscular dysfunction of bladder, not elsewhere classified
Not billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N30-N39
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
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