ICD-10 Code G70.01 – Myasthenia gravis with (acute) exacerbation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G70.01 – Myasthenia gravis with (acute) exacerbation
What it is
G70.01 identifies myasthenia gravis that is actively worsening, with an acute increase in weakness. Use it when documentation states an exacerbation or flare of this autoimmune neuromuscular disorder.
Clinical signs
Typical findings include fluctuating skeletal muscle weakness, often affecting the eyes, face, bulbar muscles, or limbs. Clinical features vary; refer to documentation, especially when notes describe worsening symptoms or an acute crisis.
When to use this code
Use this code when the provider documents myasthenia gravis with acute exacerbation, flare, or worsening disease activity. It applies to encounters focused on the active episode, not stable chronic disease. If the record only says myasthenia gravis without exacerbation, check documentation before assigning this code.
Do not use for
Do not use G70.01 for uncomplicated myasthenia gravis or for symptoms without a documented exacerbation. If the chart describes another neuromuscular disorder or an unclear weakness cause, check documentation.
Coding tip
Code the exacerbation only when the provider clearly links worsening symptoms to myasthenia gravis.