O66.4

Non-billable

Failed trial of labor

O66.4 is the ICD-10-CM code for Failed trial of labor. It is a non-billable category code — use a more specific child code such as O66.40 for billing.

Status
Header (non-billable)
Chapter
O00-O9A
Parent
O66
Subcodes
2
Edition
FY2026

O00-O9A Pregnancy, childbirth and the puerperium

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code O66.4?
O66.4 is the ICD-10-CM code for "Failed trial of labor". It falls under O00-O9A Pregnancy, childbirth and the puerperium.
Is O66.4 a billable code?
No — O66.4 is a non-billable header code. Use a more specific child code (such as O66.40) for billing.
What are the subcodes of O66.4?
O66.4 has 2 more specific child codes, including O66.40, O66.41.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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