G44.00
G44.00: Cluster headache syndrome, unspecified
Non-billable headerICD-10-CM
G44.00 is a non-billable header ICD-10-CM code for cluster headache syndrome, unspecified. It cannot be billed on its own: choose one of the more specific child codes below.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Ciliary neuralgia
- Cluster headache NOS
- Histamine cephalgia
- Lower half migraine
- Migrainous neuralgia
Excludes1 inherited from the categories above G44.00
A category’s note binds every code beneath it.
Excludes2 inherited from the categories above G44.00
Not part of this code, but both may be coded when both are present.
Other codes that can never be billed with G44.00
Their own Excludes1 notes name this code, so the conflict is not listed above.
- G43Migraine
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead G44.00
2 child codes. Green means billable.