G44.321 Chronic post-traumatic headache, 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)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 339.22 Chronic post-traumatic headache (approximate)

Code annotations containing back-references to G44.321

Back-references to G44.3

• Use Additional: F07.81 Postconcussional syndrome ("code to identify associated post-traumatic headache, if applicable (G44.3-)")
• Type 2 Excludes: G44.1 Vascular headache, not elsewhere classified ("post-traumatic headache (G44.3-)")

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 G44.321

• Headache › post-traumatic › chronic › intractable

Nearby codes

• G44.309 Post-traumatic headache, unspecified, not intractable
• G44.31 Acute post-traumatic headache
• G44.311 Acute post-traumatic headache, intractable
• G44.319 Acute post-traumatic headache, not intractable
• G44.32 Chronic post-traumatic headache
• G44.321 Chronic post-traumatic headache, intractable (this code)
• 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
• G44.41 Drug-induced headache, not elsewhere classified, intractable
• G44.5 Complicated headache syndromes