N31 vs N33
N31 and N33 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 N33
cystitis in neurogenic bladder (N31.-)
N31
Neuromuscular dysfunction of bladder, not elsewhere classified
Not billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N30-N39
N33
Bladder disorders in diseases classified elsewhere
Billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N30-N39
Indexed under
- Cystitis › bilharzial (exudative) (hemorrhagic) (septic) (suppurative)
- Disorder › bladder › in schistosomiasis (of)
- Ulcer, ulcerated, ulcerating, ulceration, ulcerative › bladderNEC › bilharzial
- Ulcer, ulcerated, ulcerating, ulceration, ulcerative › bladderNEC › in schistosomiasis
- Disease, diseased › bladder › in › schistosomiasis
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