Billable / Specific Code
ICD-10-CM O66.40 is the diagnosis code for Failed trial of labor, unspecified. This code falls under the section "Complications of labor and delivery" within Chapter 15 — Pregnancy, childbirth and the puerperium (O00-O9A). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where O66.40 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, O66.40 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
O66.40 is the ICD-10-CM diagnosis code for "Failed trial of labor, unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of O66.40 is O66.4 ("Failed trial of labor"). O66.40 provides a more specific classification within this category.
O66.40 is located in Section O60-O77 — "Complications of labor and delivery" within Chapter 15 of the ICD-10-CM Tabular List.
Use O66.40 when the patients documented diagnosis matches "Failed trial of labor, unspecified" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Failed trial of labor, unspecified is O66.40.
Yes, O66.40 can be used as a primary diagnosis code since it is billable and specific.
O66.40 is in Chapter 15 of the ICD-10-CM Tabular List.
Yes, O66.40 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.