G43.919
BillableMigraine, unspecified, intractable, without status migrainosus
HCC Category Mapping
RxHCCHCC 166 — Migraine
0.000What This Code Means
A migraine headache of unspecified type that does not respond well to treatment and does not have prolonged symptoms.
Coding Tips
- •Intractable status requires documentation of treatment failures and resistance to standard migraine therapies
- •Confirm status migrainosus is absent; if present, additional coding may be needed
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
- ✓Episode duration if available
- ✓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
G43.001-G43.019 (Migraine without aura) — use when provider documents absence of aura; more specific than unspecifiedG43.101-G43.119 (Migraine with aura) — use when visual/sensory/speech aura is documentedG43.701-G43.719 (Chronic migraine without aura) — use when frequency >=15 days/month is documentedR51.9 (Headache, unspecified) — even more nonspecific; use migraine codes when migraine is diagnosedG44.1 (Vascular headache, NEC) — different classification; migraine should be coded as migraine
Code Hierarchy
└G43Migraine└G43.9Migraine, unspecified└G43.91Migraine, unspecified, intractable└G43.919Migraine, unspecified, intractable, without status migrainosus
└G43.919Migraine, unspecified, intractable, without status migrainosus