E70.5 vs E72.0
E70.5 and E72.0 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 E72.0
disorders of tryptophan metabolism (E70.5)
E70.5
Disorders of tryptophan metabolism
Billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E70-E88
Indexed under
- Disorder › tryptophan metabolism (of)
- Disturbance › metabolism › tryptophan (s)
- Disorder › metabolism NOS › amino-acid › aromatic › tryptophan (of)
E72.0
Disorders of amino-acid transport
Not billable
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E70-E88
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