ICD-10 Code G47.20 – Circadian rhythm sleep disorder, unspecified type (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G47.20 – Circadian rhythm sleep disorder, unspecified type
What it is
This code identifies a sleep-wake pattern disorder where the body’s internal clock is misaligned with desired sleep times, but the specific circadian subtype is not documented. Use it when the record supports a circadian rhythm sleep disorder without further detail.
Clinical signs
Typical findings include difficulty falling asleep or waking at socially expected times, with daytime sleepiness or impaired alertness. Clinical features vary; refer to documentation.
When to use this code
Use G47.20 when the clinician documents circadian rhythm sleep disorder and does not specify delayed phase, advanced phase, shift work type, non-24-hour type, or irregular sleep-wake type. It also fits when the note confirms a circadian disorder but the subtype remains unclear after review. Check documentation.
Do not use for
Do not use this code for insomnia alone, poor sleep hygiene, or sleep loss from another clearly documented cause. If a specific circadian subtype is stated, code that subtype instead.
Coding tip
Query the provider for the exact circadian subtype when the note says only “circadian rhythm sleep disorder.”