Excludes1 pair
L00 vs L51.2
L00 and L51.2 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 L00
toxic epidermal necrolysis [Lyell] (L51.2)
L00
Staphylococcal scalded skin syndrome
Billable
- Chapter 12
- Diseases of the skin and subcutaneous tissue
- Section
- L00-L08
Use when the record says
- Ritter's disease
Indexed under
- Ritter's disease
- Staphylococcal scalded skin syndrome
- Dermatitis › Ritter's (exfoliativa)
- Disease, diseased › Ritter's
- Syndrome › staphylococcal scalded skin
L51.2
Toxic epidermal necrolysis [Lyell]
Billable
- Chapter 12
- Diseases of the skin and subcutaneous tissue
- Section
- L49-L54
Indexed under
- Lyell's syndrome
- Necrolysis, toxic epidermal
- Epidermolysis › necroticans combustiformis
- Lyell's syndrome › due to drug
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