| E88.40 | Mitochondrial metabolism disorder, unspecified | BILLABLE CODE |
| E88.41 | MELAS syndrome | BILLABLE CODE |
| E88.42 | MERRF syndrome | BILLABLE CODE |
| E88.43 | Disorders of mitochondrial tRNA synthetases | BILLABLE CODE |
| E88.49 | Other mitochondrial metabolism disorders | BILLABLE CODE |
