ICD-10 Code G70.1 – Toxic myoneural disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G70.1 – Toxic myoneural disorders
What it is
G70.1 identifies toxic myoneural disorders, meaning disorders of neuromuscular transmission caused by a toxic substance. Use it when documentation links weakness or impaired nerve-muscle signaling to a toxin or poison.
Clinical signs
Clinical features vary; refer to documentation. Commonly, these disorders involve fatigable weakness, ptosis, diplopia, or bulbar symptoms when the toxin affects neuromuscular junction function.
When to use this code
Use G70.1 when the provider documents a toxic myoneural disorder or toxic neuromuscular junction impairment. It may apply when the record names a specific toxic exposure and the neurologic effect is clearly attributed to that exposure. Check documentation if the toxic agent is not specified.
Do not use for
Do not use this code for myopathy, neuropathy, or generalized poisoning without documented neuromuscular transmission involvement. If the condition is better described by another neurologic or toxic effect code, choose that instead.
Coding tip
Code the toxic cause only when the record clearly connects the exposure to the myoneural disorder; otherwise, check documentation.