ICD-10-CM > O00-O9A > O30-O48 > O43 > O43.1 > O43.10 O43.10 Malformation of placenta, unspecified Non-Billable/Non-Specific Applicable To Abnormal placenta NOS Codes O43.101Malformation of placenta, unspecified, first trimesterO43.102Malformation of placenta, unspecified, second trimesterO43.103Malformation of placenta, unspecified, third trimesterO43.109Malformation of placenta, unspecified, unspecified trimester