G43.911

HCC Category Mapping

What This Code Means

This code describes a severe, ongoing migraine headache that does not respond well to treatment and has progressed into a prolonged migraine state lasting more than 72 hours. The patient is experiencing continuous or near-continuous migraine symptoms that are difficult to control with standard medications.

Coding Tips

• •Status migrainosus is a serious complication requiring documentation of failed treatment attempts and duration exceeding 72 hours; ensure clinical notes support the 'intractable' and 'status migrainosus' components before coding
• •Verify that the migraine type is truly unspecified (not with aura, without aura, or other specified type) and confirm intractability is documented; if the migraine type is known, use a more specific code instead

Clinical Significance

Unspecified migraine codes are used when the provider documents migraine but does not specify the subtype (with/without aura, hemiplegic, chronic, etc.). While these codes are valid, they represent a missed opportunity for specificity and should prompt coders to query the provider for additional detail. Unspecified codes still map to RxHCC 166 and capture the pharmacy risk associated with migraine treatment.

Documentation Requirements

• ✓Provider documentation of migraine diagnosis (even without subtype specification)
• ✓Intractability status if documented
• ✓Status migrainosus with duration >72 hours
• ✓Query opportunity: check for aura symptoms, frequency pattern, or specific variant that would support a more specific code
• ✓Migraine features present (headache with at least some typical migraine characteristics)
• ✓Current treatment plan

Commonly Confused Codes