Excludes1 pair
E34.8 vs E79-
E34.8 and E79 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 E79
progeria (E34.8)
E34.8
Other specified endocrine disorders
BillableUnspecified
- Chapter 4
- Endocrine, nutritional and metabolic diseases
- Section
- E20-E35
Use when the record says
- Pineal gland dysfunction
- Progeria
Indexed under
- Donohue's syndrome
- Gilford-Hutchinson disease
- Hutchinson-Gilford disease or syndrome
- Hyperpinealism
- Hypopinealism
E79
Disorders of purine and pyrimidine metabolism
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