P08.21 – Post-term newborn

ICD-10-CM 2027 diagnosis code · Disorders of newborn related to length of gestation and fetal growth

Billable code

ICD-10-CM code P08.21

Code: P08.21 (claims format: P0821)
Description: Post-term newborn
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 16. Certain conditions originating in the perinatal period (P00-P96)
Block: P05-P08 Disorders of newborn related to length of gestation and fetal growth
Parent codes: P08 › P08.2

Notes for P08.21

Applicable to:

Newborn with gestation period over 40 completed weeks to 42 completed weeks

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

P08 – Disorders of newborn related to long gestation and high birth weight

Includes:

the listed conditions, without further specification, as causes of morbidity or additional care, in newborn

Notes:

When both birth weight and gestational age of the newborn are available, priority of assignment should be given to birth weight

Index terms for P08.21

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in P08.2

P08.22 – Prolonged gestation of newbornBillable

Frequently asked questions

What is ICD-10 code P08.21?

P08.21 is the ICD-10-CM code for post-term newborn, in the block P05-P08 (Disorders of newborn related to length of gestation and fetal growth).

Is P08.21 a billable code?

Yes. P08.21 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does P08.21 belong to?

It belongs to category P08 – Disorders of newborn related to long gestation and high birth weight.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.