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v1.0.0
ICD-10 Guide
ICD-10 CodesG47.429

G47.429

Billable

Narcolepsy in conditions classified elsewhere without cataplexy

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

Code Description

ICD-10 G47.429 is a billable code used to indicate a diagnosis of narcolepsy in conditions classified elsewhere without cataplexy.

Key Diagnostic Point:

Narcolepsy is a chronic neurological disorder characterized by excessive daytime sleepiness and sudden sleep attacks. In cases classified under G47.429, narcolepsy occurs in the context of other underlying conditions, such as neurological disorders or metabolic syndromes, but without the presence of cataplexy, which is a sudden loss of muscle tone triggered by strong emotions. Patients may experience disrupted nighttime sleep, vivid dreams, and sleep paralysis. The diagnosis often requires comprehensive sleep studies, including polysomnography and multiple sleep latency tests, to differentiate narcolepsy from other sleep disorders like sleep apnea. The absence of cataplexy in this code indicates that while the patient suffers from narcoleptic symptoms, they do not experience the muscle weakness associated with emotional triggers. Accurate coding is essential for appropriate treatment and management of the condition, as well as for insurance reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating narcolepsy from other sleep disorders
  • Understanding the context of underlying conditions
  • Interpreting sleep study results accurately
  • Documenting the absence of cataplexy

Audit Risk Factors

  • Inadequate documentation of sleep study results
  • Failure to specify the underlying condition
  • Misclassification of narcolepsy type
  • Lack of clarity on the absence of cataplexy

Specialty Focus

Medical Specialties

Sleep Medicine

Documentation Requirements

Detailed sleep study results, patient history, and symptom descriptions.

Common Clinical Scenarios

Patients presenting with excessive daytime sleepiness and disrupted sleep patterns.

Billing Considerations

Ensure clear documentation of the absence of cataplexy and any co-existing conditions.

Neurology

Documentation Requirements

Neurological assessments, history of neurological disorders, and sleep-related symptoms.

Common Clinical Scenarios

Patients with neurological conditions presenting with sleep disturbances.

Billing Considerations

Document the relationship between neurological conditions and sleep disorders.

Coding Guidelines

Inclusion Criteria

Use G47.429 When
  • According to ICD
  • 10 guidelines, G47
  • 429 should be used when narcolepsy is diagnosed in the context of other conditions without cataplexy
  • Coders must ensure that the underlying condition is documented and that the absence of cataplexy is clearly stated

Exclusion Criteria

Do NOT use G47.429 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

95810CPT Code

Polysomnography, sleep study

Clinical Scenario

Used to diagnose narcolepsy and assess sleep patterns.

Documentation Requirements

Complete sleep study report and interpretation.

Specialty Considerations

Sleep specialists must ensure accurate interpretation of results.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of narcolepsy, improving the accuracy of diagnoses and treatment plans. G47.429 provides a clear distinction for cases without cataplexy, which aids in appropriate management and reimbursement.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of narcolepsy, improving the accuracy of diagnoses and treatment plans. G47.429 provides a clear distinction for cases without cataplexy, which aids in appropriate management and reimbursement.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    American Academy of Sleep Medicine

Coding & Billing References

  • •
    American Academy of Sleep Medicine

Frequently Asked Questions

What is the difference between narcolepsy with and without cataplexy?

Narcolepsy with cataplexy includes episodes of sudden muscle weakness triggered by strong emotions, while narcolepsy without cataplexy does not involve these episodes, focusing instead on excessive daytime sleepiness and other symptoms.