ICD-10 Code G47.27 – Circadian rhythm sleep disorder in conditions classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G47.27 – Circadian rhythm sleep disorder in conditions classified elsewhere
What it is
This code identifies a circadian rhythm sleep disorder that occurs as part of another documented condition. It means the patient’s sleep-wake timing is disrupted, but the underlying cause belongs elsewhere in the record.
Clinical signs
Common findings include difficulty falling asleep or waking at the desired time, excessive sleepiness at inappropriate times, or a persistent mismatch between sleep schedule and daily demands. Clinical features vary; refer to documentation.
When to use this code
Use G47.27 when the provider documents a circadian rhythm sleep disorder linked to another condition, and the record supports that relationship. It is appropriate when the sleep problem is not coded as a standalone primary disorder. If the chart names the underlying disease, code that condition as well.
Do not use for
Do not use this code for nonspecific insomnia, poor sleep hygiene, or sleep disturbance without a documented circadian rhythm disorder. Check documentation if the note does not clearly connect the sleep disorder to another condition.
Coding tip
Verify that the “in conditions classified elsewhere” wording matches the provider’s documentation before assigning G47.27.