ICD-10-CM 2027 diagnosis code

G43.01Migraine without aura, intractable

Not billable — use a more specific code

G43.01 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G43.01

G43.01 is the ICD-10-CM diagnosis code for migraine without aura, intractable. It belongs to category G43 (migraine), block G40-G47 (episodic and paroxysmal disorders) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within G43.0 (migraine without aura), G43.01 is specifically for migraine without aura, intractable. Related codes cover not intractable (G43.00).

To report this condition, pick the subcode that matches the documentation: G43.011 (with status migrainosus) and G43.019 (without status migrainosus).

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under G43.01

Coding notes

Applicable toConditions and synonyms classified to this code

Migraine without aura with refractory migraine

Notes that apply from higher levels

Instructions written at a parent level also apply to G43.01.

› From G43.0 Migraine without aura

Excludes1

chronic migraine without aura (G43.7-)

› From G43 Migraine

Note

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

Excludes1

lower half migraine (G44.00)

Excludes2

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)

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Code history

2016
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2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about G43.01

Is G43.01 billable?: No. G43.01 is a header code. Report one of its more specific subcodes instead.