G44.091 Other trigeminal autonomic cephalgias (TAC), 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)

• 339.09 Other trigeminal autonomic cephalgias (approximate)

Code annotations containing back-references to G44.091

Back-references to G44.0

• Type 2 Excludes: G44.1 Vascular headache, not elsewhere classified ("cluster headache (G44.0)")

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 G44.091

• Cephalgia, cephalalgia › trigeminal autonomic (TAC) NEC › intractable
• Horton's headache or neuralgia › intractable
• Neuralgia, neuralgic (acute) › Horton's › intractable
• TAC (trigeminal autonomic cephalgia) NEC › intractable

Nearby codes

• G44.049 Chronic paroxysmal hemicrania, not intractable
• G44.05 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT)
• G44.051 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable
• G44.059 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable
• G44.09 Other trigeminal autonomic cephalgias (TAC)
• G44.091 Other trigeminal autonomic cephalgias (TAC), intractable (this code)
• G44.099 Other trigeminal autonomic cephalgias (TAC), not intractable
• G44.1 Vascular headache, not elsewhere classified
• G44.2 Tension-type headache
• G44.20 Tension-type headache, unspecified
• G44.201 Tension-type headache, unspecified, intractable