N06 vs R80.0
N06 and R80.0 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 N06
Proteinuria not associated with specific morphologic lesions (R80.0)
N06
Isolated proteinuria with specified morphological lesion
Not billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N00-N08
R80.0
Isolated proteinuria
Billable
- Chapter 18
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Section
- R80-R82
Use when the record says
- Idiopathic proteinuria
Indexed under
- Proteinuria › idiopathic
- Proteinuria › isolated
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