G43 – Migraine

ICD-10-CM 2027 diagnosis code · Episodic and paroxysmal disorders

Non-billable header

ICD-10-CM code G43

Code: G43 (claims format: G43)
Description: Migraine
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 6. Diseases of the nervous system (G00-G99)
Block: G40-G47 Episodic and paroxysmal disorders

Billable codes under G43

G43 is a header code and cannot be used on claims. Choose the most specific code:

G43.0 – Migraine without auraHeader (more codes below)
G43.1 – Migraine with auraHeader (more codes below)
G43.4 – Hemiplegic migraineHeader (more codes below)
G43.5 – Persistent migraine aura without cerebral infarctionHeader (more codes below)
G43.6 – Persistent migraine aura with cerebral infarctionHeader (more codes below)
G43.7 – Chronic migraine without auraHeader (more codes below)
G43.A – Cyclical vomitingHeader (more codes below)
G43.B – Ophthalmoplegic migraineHeader (more codes below)
G43.C – Periodic headache syndromes in child or adultHeader (more codes below)
G43.D – Abdominal migraineHeader (more codes below)
G43.8 – Other migraineHeader (more codes below)
G43.9 – Migraine, unspecifiedHeader (more codes below)
G43.E – Chronic migraine with auraHeader (more codes below)

Notes for G43

Excludes1 (not coded here):

lower half migraine (G44.00)

Excludes2 (not included here):

headache NOS (R51.9)
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

Frequently asked questions

What is ICD-10 code G43?

G43 is the ICD-10-CM code for migraine, in the block G40-G47 (Episodic and paroxysmal disorders).

Is G43 a billable code?

No. G43 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.