1. ICD-10-CM Codes
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2. G00-G99
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3. G40-G47
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4. G44-
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5. 2023 ICD-10-CM Diagnosis Code G44.00

2023 ICD-10-CM Diagnosis Code G44.00

Cluster headache syndrome, unspecified

2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code

• G44.00 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
• The 2023 edition of ICD-10-CM G44.00 became effective on October 1, 2022.
• This is the American ICD-10-CM version of G44.00 - other international versions of ICD-10 G44.00 may differ.

• 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)

• 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
• 2023 (effective 10/1/2022): No change

• Type 1 Excludes: G43
  ICD-10-CM Diagnosis Code G43

  Migraine

  2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code

  Note

  • the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled

  Type 1 Excludes

  • headache NOS (R51.9)
  • lower half migraine (G44.00)

  Type 2 Excludes

  • headache syndromes (G44.-)

  Use Additional

  • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

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