ICD-10-CM 2027
ICD-10 code for continua hemicrania
From the official ICD-10-CM alphabetic index entry “Hemicrania › continua”. Page updated September 29, 2026.
About coding continua hemicrania
The ICD-10-CM code for continua hemicrania is G44.51 (Hemicrania continua).
Within G44.5 (complicated headache syndromes), G44.51 is specifically for hemicrania continua. Related codes cover New daily persistent headache (NDPH) (G44.52), primary thunderclap headache (G44.53) and other complicated headache syndrome (G44.59).
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.
Common questions about continua hemicrania ICD-10 codes
What is the ICD-10 code for continua hemicrania?
- G44.51 — Hemicrania continua.
Is G44.51 billable?
- Yes. G44.51 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G44.51 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G44.51 as a principal diagnosis.
Is G44.51 a CC or MCC?
- No. G44.51 is neither a CC nor an MCC under MS-DRG v44.0.