L95 vs M30.0
L95 and M30.0 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 L95
polyarteritis nodosa (M30.0)
L95
Vasculitis limited to skin, not elsewhere classified
Not billable
- Chapter 12
- Diseases of the skin and subcutaneous tissue
- Section
- L80-L99
M30.0
Polyarteritis nodosa
Billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M30-M36
Indexed under
- Panangiitis
- Panarteritis nodosa
- Periarteritis nodosa (disseminated) (infectious) (necrotizing)
- Polyangiitis
- Arteritis › nodosa
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