G31.82 vs G71.3
G31.82 (Leigh's disease) compared with G71.3 (Mitochondrial myopathy, not elsewhere classified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. G71.3 carries an Excludes1 note covering G31.82: “Leigh's encephalopathy (G31.82)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| G31.82Leigh's disease | G71.3Mitochondrial myopathy, not elsewhere classified | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Leigh's disease is a billable ICD-10-CM diagnosis code (G31.82). | Mitochondrial myopathy, not elsewhere classified is a billable ICD-10-CM diagnosis code (G71.3). |
| Includes | Subacute necrotizing encephalopathy | — |
| Use additional code | code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify: dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4) dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources