G47.21: Circadian rhythm sleep disorder, delayed sleep phase type
G47.21 is the billable ICD-10-CM diagnosis code for Circadian rhythm sleep disorder, delayed sleep phase type. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code G47.21?
G47.21 is the ICD-10-CM diagnosis code for Circadian rhythm sleep disorder, delayed sleep phase type. It belongs to category G47 (Sleep disorders).
Is G47.21 a billable code?
Yes. G47.21 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does G47.21 belong to?
G47.21 is part of ICD-10-CM category G47 — Sleep disorders, which has 86 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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