G44.02
Non-billableChronic cluster headache
Chronic cluster headache
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •atypical facial painG50.1
- •headache due to lumbar punctureG97.1
- •migrainesG43
- •trigeminal neuralgiaG50.0
Child Codes (2)
Related Codes(6)
Related Conditions
Also Known As / Clinical Terms(73)
UMLS
- Cephalgia, HistamineC0009088
- Cephalgias, HistamineC0009088
- Chronic Cluster HeadacheC0009088
- Chronic Cluster HeadachesC0009088
- Chronic cluster headacheC0009088
- Chronic cluster headache (disorder)C0009088
- Chronic cluster headache NOSC0009088
- Ciliary NeuralgiaC0009088
- Ciliary NeuralgiasC0009088
- Ciliary neuralgiaC0009088
- Ciliary neuralgia (finding)C0009088
- Cluster HeadacheC0009088
- Cluster Headache SyndromeC0009088
- Cluster Headache SyndromesC0009088
- Cluster Headache, ChronicC0009088
- Cluster HeadachesC0009088
- Cluster Headaches, ChronicC0009088
- Cluster headacheC0009088
- Cluster headache NOSC0009088
- Cluster headache syndromeC0009088
- Cluster headache syndrome (disorder)C0009088
- Cluster headache syndrome NOSC0009088
- Cluster headache syndrome, unspecifiedC0009088
- Cluster headachesC0009088
- Headache Syndrome, ClusterC0009088
- Headache Syndromes, ClusterC0009088
- Headache histamineC0009088
- Headache vasomotorC0009088
- Headache, Chronic ClusterC0009088
- Headache, ClusterC0009088
- Headaches clusterC0009088
- Headaches, Chronic ClusterC0009088
- Headaches, ClusterC0009088
- Histamine CephalgiaC0009088
- Histamine CephalgiasC0009088
- Histamine cephalgiaC0009088
- Histamine headacheC0009088
- Horton SyndromeC0009088
- Horton's SyndromeC0009088
- Horton's headacheC0009088
- Horton's neuralgiaC0009088
- Hortons SyndromeC0009088
- Migraine, NeuralgicC0009088
- Migraines, NeuralgicC0009088
- Migrainous neuralgiaC0009088
- Neuralgia, CiliaryC0009088
- Neuralgias, CiliaryC0009088
- Neuralgic MigraineC0009088
- Neuralgic MigrainesC0009088
- Neuralgic migraineC0009088
- Syndrome, Cluster HeadacheC0009088
- Syndrome, HortonC0009088
- Syndrome, Horton'sC0009088
- Syndromes, Cluster HeadacheC0009088
- Vasomotor headacheC0009088
- chronic cluster headacheC0009088
- chronic cluster headachesC0009088
- cluster headacheC0009088
- cluster headache syndromeC0009088
- cluster headachesC0009088
- clusters headacheC0009088
- headache clusterC0009088
- headache histamineC0009088
- headaches clusterC0009088
- headaches histamineC0009088
- histamine cephalgiaC0009088
- histamine headacheC0009088
- horton syndromeC0009088
- horton's headacheC0009088
- horton's neuralgiaC0009088
- horton's syndromeC0009088
- hortons syndromeC0009088
- migrainous neuralgiaC0009088
Frequently Asked Questions
What is the ICD-10 code for chronic cluster headache?
The ICD-10-CM code for chronic cluster headache is G44.02. The full clinical description is "Chronic cluster headache". G44.02 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code G44.02 mean?
ICD-10-CM code G44.02 represents “Chronic cluster headache”. It is classified under Chapter 6: Diseases of the Nervous System and is a non-billable header code. Use a more specific child code for billing purposes.
Is G44.02 a billable code?
No, G44.02 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 2 child codes under G44.02.
What chapter is G44.02 in?
G44.02 is in Chapter 6: Diseases of the Nervous System (codes G00-G99).
What codes cannot be used with G44.02?
G44.02 has Excludes1 notes indicating codes that cannot be used together with it, including: headache NOS (R51.9).
What are the subcategories under G44.02?
G44.02 has 2 child codes, including: G44.021 (Chronic cluster headache, intractable), G44.029 (Chronic cluster headache, not intractable).
What are the UMLS CUIs for G44.02?
G44.02 is linked to 1 UMLS Concept Unique Identifier: C0009088. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does G44.02 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like chronic cluster headache affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of G44.02?
There is no direct ICD-11 mapping available for G44.02 in the WHO crosswalk tables. This may mean the concept is classified differently in ICD-11. Use the ICD-10 to ICD-11 converter to search for related codes.
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.