ICD-10 Code G47.24 – Circadian rhythm sleep disorder, free running type (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G47.24 – Circadian rhythm sleep disorder, free running type
What it is
G47.24 identifies a circadian rhythm sleep disorder in which the sleep-wake cycle is not aligned to the 24-hour day. Sleep timing drifts later or earlier over time, causing recurring difficulty sleeping and waking at expected times.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include a progressively shifting sleep schedule, insomnia at desired bedtime, excessive sleepiness at inappropriate times, and difficulty maintaining a stable routine.
When to use this code
Use this code when the provider documents free-running circadian rhythm sleep disorder, non-24-hour sleep-wake pattern, or a similar diagnosis. It may apply when the sleep phase repeatedly drifts despite a normal environment and routine.
Code only when the record clearly supports this specific pattern. Check documentation if the note describes general insomnia, delayed sleep phase, shift-work sleep issues, or another sleep disorder instead.
Do not use for
Do not use G47.24 for ordinary sleep deprivation, jet lag, or insomnia without a documented circadian rhythm disorder. It is also not the correct code for other circadian rhythm subtypes.
Coding tip
Look for the exact phrase “free running” or “non-24-hour” in the assessment before assigning this code.