ICD-10 Code G70.00 – Myasthenia gravis without (acute) exacerbation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G70.00 – Myasthenia gravis without (acute) exacerbation
What it is
G70.00 identifies myasthenia gravis when the condition is present but not in an acute flare. It describes a chronic autoimmune neuromuscular disorder that causes fatigable weakness.
Clinical signs
Typical findings include fluctuating weakness, often affecting the eyes, face, bulbar muscles, or limbs. Clinical features vary; refer to documentation for the specific pattern and severity.
When to use this code
Use this code when the record states myasthenia gravis and does not document an acute exacerbation or crisis. It is appropriate for routine follow-up, stable disease, or ongoing management visits. If the note mentions worsening symptoms, check documentation before assigning this code.
Do not use for
Do not use G70.00 for myasthenic crisis or any documented acute exacerbation. Also avoid it when the diagnosis is uncertain or when the chart only mentions generalized weakness without confirmed myasthenia gravis.
Coding tip
Code the highest documented specificity, and verify whether the provider noted exacerbation, crisis, or stability before selecting G70.00.