Free Medical Coding > ICD10 CM > 2024 ICD-10-CM Codes > 2024 ICD-10-CM Codes O00-O9A – Pregnancy, childbirth and the puerperium (O00-O9A) > 2024 ICD-10-CM Codes O60-O77 – Complications of labor and delivery (O60-O77) > 2024 ICD-10-CM Codes O66 – Other obstructed labor (O66) > 2024 ICD-10-CM Codes O66.4 – Failed trial of labor (O66.4)