G44.1 Vascular headache, not elsewhere classified

Billable ICD-10-CM code, FY2026.

Excludes2 (not included here)

• cluster headache (G44.0)
• complicated headache syndromes (G44.5-)
• drug-induced headache (G44.4-)
• migraine (G43.-)
• other specified headache syndromes (G44.8-)
• post-traumatic headache (G44.3-)
• tension-type headache (G44.2-)

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)

• 784.0 Headache (approximate)

Code annotations containing back-references to G44.1

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 G44.1

• Headache › vascular NEC

Nearby codes

• 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
• G44.099 Other trigeminal autonomic cephalgias (TAC), not intractable
• G44.1 Vascular headache, not elsewhere classified (this code)
• G44.2 Tension-type headache
• G44.20 Tension-type headache, unspecified
• G44.201 Tension-type headache, unspecified, intractable
• G44.209 Tension-type headache, unspecified, not intractable
• G44.21 Episodic tension-type headache