M14 vs M36.4
M14 and M36.4 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 M14
hypersensitivity reactions (M36.4)
M14
Arthropathies in other diseases classified elsewhere
Not billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M05-M14
M36.4
Arthropathy in hypersensitivity reactions classified elsewhere
Billable
- Chapter 13
- Diseases of the musculoskeletal system and connective tissue
- Section
- M30-M36
Indexed under
- Arthritis, arthritic › due to or associated with › Henoch-purpura (acute) (chronic) (nonpyogenic) (subacute)
- Arthritis, arthritic › in › Henochpurpura (acute) (chronic) (nonpyogenic) (subacute)
- Arthritis, arthritic › in › hypersensitivity reaction NEC (acute) (chronic) (nonpyogenic) (subacute)
- Arthropathy › in › Henoch-Schönlein purpura
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