G43.A1 Cyclical vomiting, in migraine, intractable

Billable ICD-10-CM code, FY2026.

Applicable to

• Cyclical vomiting, with refractory migraine

Applies from G43 Migraine

Excludes1 (never code together)

• headache NOS (R51.9)
• lower half migraine (G44.00)

Excludes2 (not included here)

• headache syndromes (G44.-)

Use additional code

• code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Notes

• the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

Applies from G43.A Cyclical vomiting

Excludes1 (never code together)

• cyclical vomiting syndrome unrelated to migraine (R11.15)

Risk adjustment (HCC)

• RxHCC V08: HCC 166 — Migraine Headaches

MS-DRG index

Defines the logic of DRG(s) 102-103 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 346.21 Variants of migraine, not elsewhere classified, with intractable migraine, so stated, without mention of status migrainosus (approximate)

Code annotations containing back-references to G43.A1

Back-references to G43.A

• Type 1 Excludes: R11 Nausea and vomiting ("cyclical vomiting associated with migraine (G43.A-)")
• Type 1 Excludes: R11.15 Cyclical vomiting syndrome unrelated to migraine ("cyclical vomiting in migraine (G43.A-)")

Back-references to G43

• Type 2 Excludes: G44 Other headache syndromes ("migraines (G43.-)")
• Type 2 Excludes: G44.1 Vascular headache, not elsewhere classified ("migraine (G43.-)")
• Type 2 Excludes: G89 Pain, not elsewhere classified ("migraines (G43.-)")
• Type 2 Excludes: R51 Headache ("migraine and other headache syndromes (G43-G44)")

Diagnosis Index entries for G43.A1

• Vomiting › cyclical, in migraine, › with refractory migraine
• Vomiting › cyclical, in migraine, › intractable

Nearby codes

• G43.71 Chronic migraine without aura, intractable
• G43.711 Chronic migraine without aura, intractable, with status migrainosus
• G43.719 Chronic migraine without aura, intractable, without status migrainosus
• G43.A Cyclical vomiting
• G43.A0 Cyclical vomiting, in migraine, not intractable
• G43.A1 Cyclical vomiting, in migraine, intractable (this code)
• G43.B Ophthalmoplegic migraine
• G43.B0 Ophthalmoplegic migraine, not intractable
• G43.B1 Ophthalmoplegic migraine, intractable
• G43.C Periodic headache syndromes in child or adult
• G43.C0 Periodic headache syndromes in child or adult, not intractable