O43.109

Malformation of placenta, unspecified, unspecified trimester

Billable FY2026 2025-10-01 → 2026-09-30

This is the unspecified option. 3 more specific codes sit alongside it. Worth checking whether the documentation supports one of them.

Exclusions 10 never code together

O43code

Excludes2

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

Excludes1

Excludes2

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 7

Notes

CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
1st trimester- less than 14 weeks 0 days
2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
3rd trimester- 28 weeks 0 days until delivery

Use additional code

code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.Z3A

Index entries leading here 2

Delivery (childbirth) (labor)
- complicated O75.9
  - by
    - placenta, placental
      - malformation O43.10
Pregnancy (single) (uterine) Z33.1
- complicated by (care of) (management affected by)
  - malformation
    - placenta, placental (vessel) O43.10

Alongside this code 3 same parent — O43.10

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

Present FY2024–FY2027.