O43.1 – Malformation of placenta

ICD-10-CM 2027 diagnosis code · Maternal care related to the fetus and amniotic cavity and possible delivery problems

Non-billable header

ICD-10-CM code O43.1

Code: O43.1 (claims format: O431)
Description: Malformation of placenta
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: O30-O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems
Parent codes: O43

Billable codes under O43.1

O43.1 is a header code and cannot be used on claims. Choose the most specific code:

O43.10 – Malformation of placenta, unspecifiedHeader (more codes below)
O43.11 – Circumvallate placentaHeader (more codes below)
O43.12 – Velamentous insertion of umbilical cordHeader (more codes below)
O43.19 – Other malformation of placentaHeader (more codes below)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

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.-)

Related codes in O43

O43.0 – Placental transfusion syndromesHeader
O43.2 – Morbidly adherent placentaHeader
O43.8 – Other placental disordersHeader
O43.9 – Unspecified placental disorderHeader

Frequently asked questions

What is ICD-10 code O43.1?

O43.1 is the ICD-10-CM code for malformation of placenta, in the block O30-O48 (Maternal care related to the fetus and amniotic cavity and possible delivery problems).

Is O43.1 a billable code?

No. O43.1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does O43.1 belong to?

It belongs to category O43 – Placental disorders.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.