ICD-10 Code G43.4 – Hemiplegic migraine (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G43.4 – Hemiplegic migraine
What it is
G43.4 identifies hemiplegic migraine, a migraine subtype that includes temporary weakness on one side of the body. It is used when documentation specifically states hemiplegic migraine.
Clinical signs
Typical features include migraine headache with reversible motor weakness and other aura symptoms such as visual, sensory, or speech changes. Clinical features vary; refer to documentation.
When to use this code
Use G43.4 when the provider documents hemiplegic migraine or a migraine with unilateral motor weakness consistent with that diagnosis. Apply it for confirmed episodes and for ongoing records that clearly identify this migraine subtype.
If the note only says migraine, migraine with aura, or transient weakness without naming hemiplegic migraine, check documentation before coding. You should code the most specific diagnosis stated by the clinician.
Do not use for
Do not use this code for ordinary migraine without motor weakness, stroke, or other neurologic disorders that mimic migraine. Check documentation if the diagnosis is uncertain.
Coding tip
Look for the exact phrase “hemiplegic migraine” or clear documentation of migraine with motor weakness before assigning G43.4.