N01.5 vs N01.A
N01.5 and N01.A 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.
N01.5
Rapidly progressive nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
Billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N00-N08
Use when the record says
- Rapidly progressive nephritic syndrome with membranoproliferative glomerulonephritis, types 1 and 3, or NOS
Indexed under
- Nephritis, nephritic › rapidly progressive › with › diffuse › mesangiocapillary glomerulonephritis (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)
N01.A
Rapidly progressive nephritic syndrome with C3 glomerulonephritis
Billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N00-N08
Use when the record says
- Rapidly progressive nephritic syndrome with C3 glomerulopathy, NOS
Indexed under
- Nephritis, nephritic › rapidly progressive › with › C3 › glomerulonephritis (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)
- Nephritis, nephritic › rapidly progressive › with › C3 › glomerulopathy (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)
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