ICD-10 Code G47.2 – Circadian rhythm sleep disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G47.2 – Circadian rhythm sleep disorders
What it is
G47.2 identifies sleep-wake disorders caused by a mismatch between the body’s internal clock and required sleep times. Use it for circadian rhythm sleep disorders when documentation supports this diagnosis.
Clinical signs
Common findings include persistent insomnia, excessive sleepiness, or both, with a recurring pattern tied to timing of sleep. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents a circadian rhythm sleep disorder, such as delayed sleep phase or shift-work-related sleep disturbance. It may also fit when the record clearly describes abnormal sleep timing due to circadian misalignment. Check documentation for the specific subtype if needed.
Do not use for
Do not use it for routine insomnia without a circadian component, or for sleep problems explained better by another disorder. If the cause is unclear, check documentation before assigning G47.2.
Coding tip
Capture the documented subtype and the sleep-wake pattern, because that detail can support accurate code selection.