ICD-10-CM 2027
ICD-10 code for medication overuse headache
From the official ICD-10-CM alphabetic index entry “Headache › medication overuse”. Page updated September 29, 2026.
About coding medication overuse headache
The ICD-10-CM code for medication overuse headache is G44.40 (Drug-induced headache, not elsewhere classified, 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 G44.40.
Within G44.4 (drug-induced headache, not elsewhere classified), G44.40 is specifically for drug-induced headache, not elsewhere classified, not intractable. Related codes cover intractable (G44.41).
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 medication overuse headache codes (official index)
Common questions about medication overuse headache ICD-10 codes
What is the ICD-10 code for medication overuse headache?
- G44.40 — Drug-induced headache, not elsewhere classified, not intractable. More specific codes apply when the documentation supports them: G44.41, G44.40.
What is the ICD-10 code for intractable medication overuse headache?
- G44.41 — Drug-induced headache, not elsewhere classified, intractable.
Is G44.40 billable?
- Yes. G44.40 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G44.40 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G44.40 as a principal diagnosis.
Is G44.40 a CC or MCC?
- No. G44.40 is neither a CC nor an MCC under MS-DRG v44.0.