G44.01 is the authoritative medical code for Episodic cluster headache. This classification is used in medical billing and clinical recording to specify the clinical criteria for episodic cluster headache (ICD-10-CM G44.01), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Episodic cluster headache is a non-billable ICD-10-CM category code G44.01. A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): 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.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for G44.01 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- atypical facial pain G50.1
- headache due to lumbar puncture G97.1
- migraines G43.-
- trigeminal neuralgia G50.0
Frequently Asked Questions (FAQ) & Clinical Guidance
Can G44.01 be billed directly?
No. G44.01 (Episodic cluster headache) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
What can't be coded together with G44.01?
Per Excludes1 instructions, G44.01 must not be reported with: headache NOS (R51.9).
Can G44.01 be reported alongside related conditions?
Per Excludes2 instructions, G44.01 and the following may both be reported when both are present: atypical facial pain (G50.1); headache due to lumbar puncture (G97.1); migraines (G43.-); trigeminal neuralgia (G50.0).
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as G44.01, with their registry titles.
- G44 — Other headache syndromes
- G44.0 — Cluster headaches and other trigeminal autonomic cephalgias (TAC)
- G44.00 — Cluster headache syndrome, unspecified
- G44.001 — Cluster headache syndrome, unspecified, intractable
- G44.009 — Cluster headache syndrome, unspecified, not intractable
- G44.011 — Episodic cluster headache, intractable
- G44.019 — Episodic cluster headache, not intractable
- G44.02 — Chronic cluster headache
- G44.021 — Chronic cluster headache, intractable
- G44.029 — Chronic cluster headache, not intractable
- G44.03 — Episodic paroxysmal hemicrania
- G44.031 — Episodic paroxysmal hemicrania, intractable
- G44.039 — Episodic paroxysmal hemicrania, not intractable
- G44.04 — Chronic paroxysmal hemicrania
- G44.041 — Chronic paroxysmal hemicrania, intractable
- 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
- 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
- G44.209 — Tension-type headache, unspecified, not intractable
- G44.21 — Episodic tension-type headache
- G44.211 — Episodic tension-type headache, intractable
- G44.219 — Episodic tension-type headache, not intractable
- G44.22 — Chronic tension-type headache
- G44.221 — Chronic tension-type headache, intractable
- G44.229 — Chronic tension-type headache, not intractable
- G44.3 — Post-traumatic headache
- G44.30 — Post-traumatic headache, unspecified
- G44.301 — Post-traumatic headache, unspecified, intractable
- 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
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code G40.01
Localization-related (focal) (partial) idiopathic epilepsy and epileptic syndromes with seizures of localized onset, intractable