FY2027
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Excludes1 pair

N30- vs N39.0

N30 and N39.0 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 N39.0
cystitis (N30.-)
N30

Cystitis

Not billable
Chapter 14
Diseases of the genitourinary system
Section
N30-N39
N39.0

Urinary tract infection, site not specified

Billable
Chapter 14
Diseases of the genitourinary system
Section
N30-N39
Indexed under
  • Infection, infected, infective › urinary (tract)
  • Urine › pus in
  • Pus › in › urine

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