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ICD-10-CM 2027 diagnosis code

G43Migraine

Not billable — use a more specific code

G43 is a header code, so it can't be reported by itself. Choose one of the 13 more specific codes beneath it.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About G43

G43 is the ICD-10-CM diagnosis code for migraine. It belongs to 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 13 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: G43.0 (without aura), G43.1 (with aura), G43.4 (migraine), G43.5 (infarction), G43.6 (infarction), G43.7 (aura), G43.8 (migraine), G43.9 (unspecified) and 5 more.

Don't report G43 together with the conditions in its Excludes1 note: lower half migraine (G44.00).

The conditions in its Excludes2 note aren't part of G43, but may be coded alongside it if the patient has both: headache NOS (R51.9) and headache syndromes (G44.-).

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

Coding notes

Note
  • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Excludes1Not coded here — never report together with this code
Excludes2Not included here — may be reported together if both conditions exist
  • headache NOS (R51.9)
  • headache syndromes (G44.-)
Use additional codeAdd a secondary code to fully describe the condition
  • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Notes that apply from higher levels

Instructions written at a parent level also apply to G43.

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

Codes whose notes reference G43

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about G43

Is G43 billable?

No. G43 is a header code. Report one of its more specific subcodes instead.