ICD-10-CM 2027
ICD-10 code for ciliary neuralgia
From the official ICD-10-CM alphabetic index entry “Neuralgia, neuralgic (acute) › ciliary”. Page updated September 29, 2026.
About coding ciliary neuralgia
The ICD-10-CM code for ciliary neuralgia is G44.009 (Cluster headache syndrome, unspecified, not intractable). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on G44.009.
Within G44.00 (cluster headache syndrome, unspecified), G44.009 is specifically for cluster headache syndrome, unspecified, not intractable. Related codes cover intractable (G44.001).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 102 (Headaches with MCC, relative weight 1.1201) and DRG 103 (Headaches without MCC, relative weight 0.822), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific ciliary neuralgia codes (official index)
Common questions about ciliary neuralgia ICD-10 codes
What is the ICD-10 code for ciliary neuralgia?
- G44.009 — Cluster headache syndrome, unspecified, not intractable. More specific codes apply when the documentation supports them: G44.001, G44.009.
What is the ICD-10 code for intractable ciliary neuralgia?
- G44.001 — Cluster headache syndrome, unspecified, intractable.
Is G44.009 billable?
- Yes. G44.009 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G44.009 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G44.009 as a principal diagnosis.
Is G44.009 a CC or MCC?
- No. G44.009 is neither a CC nor an MCC under MS-DRG v44.0.