FY2027
MenuClose
Excludes1 pair

N31- vs N33

N31 and N33 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

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
  • Disorder › bladder › in schistosomiasis
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerative › bladder NEC › bilharzial
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerative › bladder NEC › in schistosomiasis (bilharzial)
  • Disease, diseased › bladder › in › schistosomiasis (bilharziasis)

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