O43.191 Other malformation of placenta, first trimester

Billable ICD-10-CM code, FY2026.

Applies from O43 Placental disorders

Excludes2 (not included here)

• maternal care for poor fetal growth due to placental insufficiency (O36.5-)
• placenta previa (O44.-)
• placental polyp (O90.89)
• placentitis (O41.14-)
• premature separation of placenta [abruptio placentae] (O45.-)

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 656.71 Other placental conditions, affecting management of mother, delivered, with or without mention of antepartum condition (approximate)
• 656.73 Other placental conditions, affecting management of mother, antepartum condition or complication (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Nearby codes

• O43.121 Velamentous insertion of umbilical cord, first trimester
• O43.122 Velamentous insertion of umbilical cord, second trimester
• O43.123 Velamentous insertion of umbilical cord, third trimester
• O43.129 Velamentous insertion of umbilical cord, unspecified trimester
• O43.19 Other malformation of placenta
• O43.191 Other malformation of placenta, first trimester (this code)
• O43.192 Other malformation of placenta, second trimester
• O43.193 Other malformation of placenta, third trimester
• O43.199 Other malformation of placenta, unspecified trimester
• O43.2 Morbidly adherent placenta
• O43.21 Placenta accreta