G44.4Drug-induced headache, not elsewhere classified

G44.4 is the ICD-10-CM diagnosis code for drug-induced headache, not elsewhere classified. It belongs to category G44 (other headache syndromes), 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 2 subcodes must be used instead.

Within G44 (other headache syndromes), G44.4 is specifically for drug-induced headache, not elsewhere classified. Related codes cover cluster headaches and other trigeminal autonomic cephalgias (TAC) (G44.0), vascular headache, not elsewhere classified (G44.1), tension-type headache (G44.2), post-traumatic headache (G44.3), complicated headache syndromes (G44.5) and other specified headache syndromes (G44.8).

To report this condition, pick the subcode that matches the documentation: G44.40 (not intractable) and G44.41 (intractable).

Use an additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.