Disorders of mitochondrial tRNA synthetases

This code identifies a group of rare genetic disorders characterized by mutations in genes encoding mitochondrial transfer RNA (tRNA) synthetases. These enzymes are crucial for protein synthesis within mitochondria, and their dysfunction leads to impaired mitochondrial function and a wide range of clinical manifestations affecting multiple organ systems. The specific clinical presentation varies depending on the affected tRNA synthetase and the severity of the mutation.

Use this code when documentation confirms a diagnosis of a mitochondrial tRNA synthetase disorder, often established through genetic testing identifying pathogenic variants in relevant genes (e.g., MARS, RARS, YARS). This code is appropriate for patients presenting with symptoms such as developmental delay, neurological dysfunction (e.g., ataxia, epilepsy), myopathy, cardiomyopathy, or liver disease, where a mitochondrial tRNA synthetase defect has been definitively diagnosed.

• Always confirm the specific mitochondrial tRNA synthetase disorder through genetic testing results documented in the patient's record.
• Consider sequencing this code as the primary diagnosis when it is the underlying cause of the patient's presenting symptoms.
• Code any associated clinical manifestations (e.g., cardiomyopathy, epilepsy) separately as secondary diagnoses to fully capture the patient's clinical picture.