G44.40 Drug-induced headache, not elsewhere classified, not intractable

Billable ICD-10-CM code, FY2026.

Applies from G44 Other headache syndromes

Excludes1 (never code together)

• headache NOS (R51.9)

Excludes2 (not included here)

• atypical facial pain (G50.1)
• headache due to lumbar puncture (G97.1)
• migraines (G43.-)
• trigeminal neuralgia (G50.0)

Applies from G44.4 Drug-induced headache, not elsewhere classified

Applicable to

• Medication overuse headache

Use additional code

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

MS-DRG index

Defines the logic of DRG(s) 102-103 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 339.3 Drug induced headache, not elsewhere classified (approximate)

Code annotations containing back-references to G44.40

Back-references to G44.4

• Type 2 Excludes: G44.1 Vascular headache, not elsewhere classified ("drug-induced headache (G44.4-)")

Back-references to G44

• Type 2 Excludes: G43 Migraine ("headache syndromes (G44.-)")
• Type 2 Excludes: G89 Pain, not elsewhere classified ("headache syndromes (G44.-)")
• Type 2 Excludes: R51 Headache ("migraine and other headache syndromes (G43-G44)")

Diagnosis Index entries for G44.40

• Headache › drug-induced NEC
• Headache › drug-induced NEC › not intractable
• Headache › medication overuse
• Headache › medication overuse › not intractable
• Headache › rebound
• Headache › rebound › not intractable

Nearby codes

• G44.319 Acute post-traumatic headache, not intractable
• G44.32 Chronic post-traumatic headache
• G44.321 Chronic post-traumatic headache, intractable
• G44.329 Chronic post-traumatic headache, not intractable
• G44.4 Drug-induced headache, not elsewhere classified
• G44.40 Drug-induced headache, not elsewhere classified, not intractable (this code)
• G44.41 Drug-induced headache, not elsewhere classified, intractable
• G44.5 Complicated headache syndromes
• G44.51 Hemicrania continua
• G44.52 New daily persistent headache (NDPH)
• G44.53 Primary thunderclap headache