P08.21: Post-term newborn
P08.21 is the billable ICD-10-CM diagnosis code for Post-term newborn. 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 P08.21?
P08.21 is the ICD-10-CM diagnosis code for Post-term newborn. It belongs to category P08 (Disorders of newborn related to long gestation and high birth weight).
Is P08.21 a billable code?
Yes. P08.21 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 P08.21 belong to?
P08.21 is part of ICD-10-CM category P08 — Disorders of newborn related to long gestation and high birth weight, which has 8 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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