G43.901
BillableMigraine, unspecified, not intractable, with status migrainosus
HCC Category Mapping
RxHCCHCC 166 — Migraine
0.000What This Code Means
A migraine headache of unspecified type that can be managed with treatment and has prolonged symptoms lasting 72 hours or more.
Coding Tips
- •Use this code only when the specific migraine type cannot be determined from documentation
- •Status migrainosus must be documented; this indicates a migraine emergency requiring hospitalization
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)
- ✓Treatment response documented, or default to not intractable if not specified
- ✓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
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└G43.90Migraine, unspecified, not intractable└G43.901Migraine, unspecified, not intractable, with status migrainosus
└G43.901Migraine, unspecified, not intractable, with status migrainosus