ICD-10 Code G70.0 – Myasthenia gravis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G70.0 – Myasthenia gravis
What it is
G70.0 identifies myasthenia gravis, an autoimmune disorder that causes fluctuating weakness of voluntary muscles. It reflects the condition itself, not a specific complication or crisis.
Clinical signs
Typical findings include fatigable weakness, ptosis, diplopia, and bulbar or limb weakness that worsens with activity and improves with rest. Clinical features vary; refer to documentation.
When to use this code
Use G70.0 when the record documents myasthenia gravis as the confirmed diagnosis. It is appropriate for outpatient visits, inpatient stays, and specialist follow-up when the condition is being evaluated, monitored, or managed. Check documentation if the note only says “weakness” without confirmation.
Do not use for
Do not use this code for generalized weakness, fatigue, or other neuromuscular disorders without documented myasthenia gravis. If the provider documents a myasthenic crisis or another specific subtype, code that documented condition instead.
Coding tip
Code G70.0 only when the diagnosis is clearly stated; otherwise, query or check documentation before assigning it.