Excludes1 pair
L50- vs L56.3
L50 and L56.3 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 L50
solar urticaria (L56.3)
L56.3
Solar urticaria
Billable
- Chapter 12
- Diseases of the skin and subcutaneous tissue
- Section
- L55-L59
Indexed under
- Urticaria › solar
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