E88.43
Disorders of mitochondrial tRNA synthetases
Clinical Classification Guidelines
Inclusion Terms
- ARS2-related mitochondrial disorders
- LBSL
- Leukoencephalopathy with brainstem - spinal cord involvement - lactate elevation
- Leukoencephalopathy with thalamus - brainstem involvement - high lactate
- LTBL
- Mitochondrial aminoacyl-tRNA synthetase disorders
Code Also
- , if applicable, associated condition such as:
- leukoencephalopathy (G93.49)
Medical Intelligence & Overview
Disorders of mitochondrial tRNA synthetases are rare genetic conditions affecting the mitochondria, which are the energy-producing structures within cells. Specifically, these disorders involve problems with enzymes called aminoacyl-tRNA synthetases, essential for protein synthesis inside mitochondria. Dysfunction in these enzymes can lead to a range of neurological and systemic symptoms. They are often classified under mitochondrial aminoacyl-tRNA synthetase disorders and include conditions like LBSL (Leukoencephalopathy with Brainstem and Spinal Cord Involvement and Lactate Elevation) and LTBL (Leukoencephalopathy with Thalamus and Brainstem Involvement).
Causes & Symptoms
Clinical Causes: Inherited genetic mutations affecting mitochondrial aminoacyl-tRNA synthetase enzymes Autosomal recessive inheritance pattern, meaning two copies of the mutated gene are needed for the disorder to develop Potentially influenced by genetic variations that impair enzyme function, leading to defective mitochondrial protein synthesis
Key Symptoms: Progressive neurological deterioration Leukoencephalopathy, which involves abnormal white matter changes in the brain Brainstem involvement, affecting vital functions and nerve pathways Spinal cord issues, leading to motor or sensory symptoms Lactate elevation in blood or cerebrospinal fluid, indicating mitochondrial dysfunction Muscle weakness or fatigue Possible developmental delays or neuroregression in children Ataxia, presenting as uncoordinated movements Speech and swallowing difficulties Optic atrophy and vision problems in some cases
Diagnostic & Treatment
Diagnosis Path: Magnetic resonance imaging (MRI) revealing characteristic white matter abnormalities and brainstem or spinal cord involvement Laboratory tests showing elevated lactate levels in blood or cerebrospinal fluid Genetic testing to identify mutations in genes encoding mitochondrial aminoacyl-tRNA synthetases Assessment of neurological function and development Exclusion of other mitochondrial or neurological disorders
Treatment Protocols: Physical therapy to maintain mobility and strength Occupational therapy to assist with daily activities Speech and language therapy for communication and swallowing difficulties Nutritional support tailored to individual needs Monitoring and managing seizures if they occur Supportive treatments for symptoms such as muscle weakness or neurological impairments
Clinical Advice & FAQs
Billing Guidance
Is E88.43 a billable ICD-10 code?
Yes, E88.43 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report E88.43?
Clinical documentation must specify the nature of Disorders of mitochondrial tRNA synthetases and any associated comorbidities for accurate reporting.
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