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ICD-10-CM 2027 diagnosis code

G44Other headache syndromes

Not billable — use a more specific code

G44 is a header code, so it can't be reported by itself. Choose one of the 7 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 G44

G44 is the ICD-10-CM diagnosis code for other headache syndromes. 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 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: G44.0 ((TAC)), G44.1 (classified), G44.2 (headache), G44.3 (headache), G44.4 (classified), G44.5 (syndromes) and G44.8 (syndromes).

Don't report G44 together with the conditions in its Excludes1 note: headache NOS (R51.9).

The conditions in its Excludes2 note aren't part of G44, but may be coded alongside it if the patient has both: atypical facial pain (G50.1), headache due to lumbar puncture (G97.1), migraines (G43.-) and trigeminal neuralgia (G50.0).

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 G44

Coding notes

Excludes1Not coded here — never report together with this code
Excludes2Not included here — may be reported together if both conditions exist
  • atypical facial pain (G50.1)
  • headache due to lumbar puncture (G97.1)
  • migraines (G43.-)
  • trigeminal neuralgia (G50.0)

Notes that apply from higher levels

Instructions written at a parent level also apply to G44.

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

Codes whose notes reference G44

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 G44

Is G44 billable?

No. G44 is a header code. Report one of its more specific subcodes instead.