2022 ICD-10-CM Diagnosis Code G44.009

Cluster headache syndrome, unspecified, not intractable

    2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
  • G44.009 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2022 edition of ICD-10-CM G44.009 became effective on October 1, 2021.
  • This is the American ICD-10-CM version of G44.009 - other international versions of ICD-10 G44.009 may differ.
Applicable To
  • Cluster headache syndrome NOS
The following code(s) above G44.009 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G44.009:
  • G00-G99
    2022 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the nervous system
  • G44
    ICD-10-CM Diagnosis Code G44

    Other headache syndromes

      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Type 2 Excludes
    • atypical facial pain (G50.1)
    • headache due to lumbar puncture (G97.1)
    • migraines (G43.-)
    • trigeminal neuralgia (G50.0)
    Other headache syndromes
  • G44.00
    ICD-10-CM Diagnosis Code G44.00

    Cluster headache syndrome, unspecified

      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    Applicable To
    • Ciliary neuralgia
    • Cluster headache NOS
    • Histamine cephalgia
    • Lower half migraine
    • Migrainous neuralgia
    Cluster headache syndrome, unspecified
Approximate Synonyms
  • Cluster headache
  • Headache, cluster
Clinical Information
  • A primary headache disorder that is characterized by severe, strictly unilateral pain which is orbital, supraorbital, temporal or in any combination of these sites, lasting 15-180 min. Occurring 1 to 8 times a day. The attacks are associated with one or more of the following, all of which are ipsilateral: conjunctival injection, lacrimation, nasal congestion, rhinorrhea, facial sweating, eyelid edema, and miosis. (international classification of headache disorders, 2nd ed. Cephalalgia 2004: suppl 1)
ICD-10-CM G44.009 is grouped within Diagnostic Related Group(s) (MS-DRG v39.0):
  • 102 Headaches with mcc
  • 103 Headaches without mcc

Convert G44.009 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change

Diagnosis Index entries containing back-references to G44.009:

ICD-10-CM Codes Adjacent To G44.009
G43.90 Migraine, unspecified, not intractable
G43.901 …… with status migrainosus
G43.909 …… without status migrainosus
G43.91 Migraine, unspecified, intractable
G43.911 …… with status migrainosus
G43.919 …… without status migrainosus
G44 Other headache syndromes
G44.0 Cluster headaches and other trigeminal autonomic cephalgias (TAC)
G44.00 Cluster headache syndrome, unspecified
G44.001 …… intractable
G44.009 …… not intractable
G44.01 Episodic cluster headache
G44.011 …… intractable
G44.019 …… not intractable
G44.02 Chronic cluster headache
G44.021 …… intractable
G44.029 …… not intractable
G44.03 Episodic paroxysmal hemicrania
G44.031 …… intractable
G44.039 …… not intractable
G44.04 Chronic paroxysmal hemicrania

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.