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v1.0.0
ICD-10 Guide
ICD-10 CodesG44.009

G44.009

Billable

Cluster headache syndrome, unspecified, not intractable

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 G44.009 is a billable code used to indicate a diagnosis of cluster headache syndrome, unspecified, not intractable.

Key Diagnostic Point:

Cluster headache syndrome is characterized by recurrent, severe unilateral headaches that occur in clusters or bouts, typically lasting from 15 minutes to 3 hours. These headaches are often accompanied by autonomic symptoms such as lacrimation, nasal congestion, and ptosis on the affected side. The pain is typically described as sharp or burning and can be debilitating. Unlike migraines, cluster headaches occur in cyclical patterns, with periods of frequent attacks followed by remission. The exact etiology remains unclear, but it is believed to involve dysfunction in the hypothalamus and trigeminal nerve pathways. Triggers may include alcohol consumption, smoking, strong odors, and changes in sleep patterns. Preventive treatments include medications such as verapamil, corticosteroids, and lithium, while acute treatments may involve oxygen therapy or triptans. Accurate diagnosis and coding are essential for effective management and treatment planning.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between cluster headaches and other headache types such as migraines.
  • Understanding the episodic nature of cluster headaches and their triggers.
  • Identifying the severity and frequency of attacks for appropriate coding.
  • Documenting associated symptoms accurately to support the diagnosis.

Audit Risk Factors

  • Inadequate documentation of headache characteristics and frequency.
  • Failure to specify the type of headache when multiple types are present.
  • Misclassification of intractable versus non-intractable headaches.
  • Lack of documentation regarding triggers and associated symptoms.

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed headache diaries, descriptions of headache characteristics, and response to treatments.

Common Clinical Scenarios

Patients presenting with recurrent headaches, particularly those with a history of cluster headaches.

Billing Considerations

Neurologists should ensure comprehensive documentation of headache patterns and triggers to support accurate coding.

Primary Care

Documentation Requirements

Thorough patient history, including family history of headaches and lifestyle factors.

Common Clinical Scenarios

Patients with new-onset headaches or those with a known history of headache disorders.

Billing Considerations

Primary care providers should be aware of the need for referrals to specialists for complex cases.

Coding Guidelines

Inclusion Criteria

Use G44.009 When
  • According to ICD
  • 10 guidelines, G44
  • 009 should be used when the cluster headache syndrome is not specified as intractable
  • Documentation must support the diagnosis, including the frequency and severity of headaches

Exclusion Criteria

Do NOT use G44.009 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for follow-up visits for cluster headache management.

Documentation Requirements

Document the patient's headache history, treatment response, and any changes in symptoms.

Specialty Considerations

Neurologists may require more detailed documentation than primary care providers.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of headache disorders, improving the accuracy of diagnoses and treatment plans. G44.009 provides a clear classification for non-intractable cluster headaches, facilitating better patient management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of headache disorders, improving the accuracy of diagnoses and treatment plans. G44.009 provides a clear classification for non-intractable cluster headaches, facilitating better patient management.

Reimbursement & Billing Impact

reimbursement and compliance.

Resources

Clinical References

  • •
    American Academy of Neurology - Headache Disorders

Coding & Billing References

  • •
    American Academy of Neurology - Headache Disorders

Frequently Asked Questions

What distinguishes cluster headaches from migraines?

Cluster headaches are characterized by severe unilateral pain occurring in cyclical patterns, often accompanied by autonomic symptoms, while migraines typically present with bilateral pain and may include aura symptoms.