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v1.0.0
ICD-10 Guide
ICD-10 CodesG43.70

G43.70

Billable

Chronic migraine without aura, not intractable

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

Code Description

ICD-10 G43.70 is a billable code used to indicate a diagnosis of chronic migraine without aura, not intractable.

Key Diagnostic Point:

Chronic migraine without aura is characterized by the occurrence of headache episodes that meet the criteria for migraine without aura on 15 or more days per month over a period of three months. These headaches can be moderate to severe in intensity and are often unilateral, pulsating, and aggravated by routine physical activity. Patients may experience associated symptoms such as nausea, vomiting, and photophobia or phonophobia. Unlike intractable migraines, which are resistant to treatment and significantly impair daily functioning, chronic migraines without aura are manageable with appropriate interventions. The condition can be triggered by various factors, including stress, hormonal changes, dietary factors, sleep disturbances, and environmental stimuli. Effective management often involves a combination of lifestyle modifications, preventive medications, and acute treatments to alleviate symptoms during headache episodes.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between chronic and episodic migraines
  • Identifying triggers and their documentation
  • Understanding the distinction between intractable and non-intractable migraines
  • Variability in patient presentation and symptomatology

Audit Risk Factors

  • Inadequate documentation of headache frequency
  • Failure to note associated symptoms
  • Misclassification of migraine type
  • Lack of evidence for preventive treatment trials

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed headache diaries, treatment history, and response to therapies.

Common Clinical Scenarios

Patients presenting with frequent headaches, requiring evaluation for chronic migraine management.

Billing Considerations

Neurologists must document the frequency and severity of headaches to support the chronic migraine diagnosis.

Primary Care

Documentation Requirements

Comprehensive patient history, including lifestyle factors and previous treatments.

Common Clinical Scenarios

Patients with recurrent headaches seeking management options.

Billing Considerations

Primary care providers should assess for comorbid conditions that may exacerbate migraines.

Coding Guidelines

Inclusion Criteria

Use G43.70 When
  • According to the official coding guidelines, G43
  • 70 should be used when the patient has chronic migraines without aura that are not intractable
  • Documentation must support the diagnosis, including headache frequency and associated symptoms

Exclusion Criteria

Do NOT use G43.70 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 chronic migraine management.

Documentation Requirements

Document history of present illness, review of systems, and treatment plan.

Specialty Considerations

Neurologists may require more detailed documentation of neurological examinations.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of migraine types, improving the accuracy of data collection and treatment planning. G43.70 provides a clear distinction for chronic migraines without aura, facilitating better management strategies.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of migraine types, improving the accuracy of data collection and treatment planning. G43.70 provides a clear distinction for chronic migraines without aura, facilitating better management strategies.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    American Migraine Foundation

Coding & Billing References

  • •
    American Migraine Foundation

Frequently Asked Questions

What distinguishes chronic migraine without aura from episodic migraine?

Chronic migraine without aura is defined by the occurrence of headache days on 15 or more days per month for at least three months, while episodic migraine occurs less frequently.