G43.811

HCC Category Mapping

What This Code Means

This code describes a severe migraine headache that doesn't respond well to treatment and is accompanied by status migrainosus, which is a prolonged migraine attack lasting more than 72 hours. The migraine doesn't fit into other specific migraine categories.

Coding Tips

• •Verify that the migraine is documented as 'intractable' (resistant to treatment) and that status migrainosus is explicitly mentioned in the clinical notes before assigning this code
• •This code requires documentation of failed treatment attempts; ensure the provider has documented why standard migraine treatments were ineffective

Clinical Significance

Other migraine codes capture migraine subtypes that do not fit standard categories such as retinal migraine, vestibular migraine, or migraine variants not elsewhere classified. These codes are important for accurately representing atypical presentations that still carry significant clinical burden and treatment needs. Proper use prevents both overcoding of more specific subtypes and undercoding to unspecified migraine.

Documentation Requirements

• ✓Specific migraine variant type documented by provider (e.g., retinal, vestibular, basilar-type features)
• ✓Clinical features that distinguish this from standard migraine with or without aura
• ✓Reason the condition does not fit a more specific migraine code category
• ✓Intractability status documented
• ✓Status migrainosus with duration >72 hours if applicable
• ✓Neurological examination findings specific to the variant type
• ✓Diagnostic workup results supporting the specific migraine variant diagnosis

Commonly Confused Codes