Placental disorders (O43) ICD-10-CM
The O43 code range covers placental disorders with 65 ICD-10-CM diagnosis codes. 48 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the O43 Range 65 codes · 48 billable
- O43 Placental disordersNon-billable
- O43.0 Placental transfusion syndromesNon-billable
- O43.01 Fetomaternal placental transfusion syndromeNon-billable
- O43.011 Fetomaternal placental transfusion syndrome, first trimester
- O43.012 Fetomaternal placental transfusion syndrome, second trimester
- O43.013 Fetomaternal placental transfusion syndrome, third trimester
- O43.019 Fetomaternal placental transfusion syndrome, unspecified trimester
- O43.02 Fetus-to-fetus placental transfusion syndromeNon-billable
- O43.021 Fetus-to-fetus placental transfusion syndrome, first trimester
- O43.022 Fetus-to-fetus placental transfusion syndrome, second trimester
- O43.023 Fetus-to-fetus placental transfusion syndrome, third trimester
- O43.029 Fetus-to-fetus placental transfusion syndrome, unspecified trimester
- O43.1 Malformation of placentaNon-billable
- O43.10 Malformation of placenta, unspecifiedNon-billable
- O43.101 Malformation of placenta, unspecified, first trimester
- O43.102 Malformation of placenta, unspecified, second trimester
- O43.103 Malformation of placenta, unspecified, third trimester
- O43.109 Malformation of placenta, unspecified, unspecified trimester
- O43.11 Circumvallate placentaNon-billable
- O43.111 Circumvallate placenta, first trimester
- O43.112 Circumvallate placenta, second trimester
- O43.113 Circumvallate placenta, third trimester
- O43.119 Circumvallate placenta, unspecified trimester
- O43.12 Velamentous insertion of umbilical cordNon-billable
- 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 placentaNon-billable
- O43.191 Other malformation of placenta, first trimester
- 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 placentaNon-billable
- O43.21 Placenta accretaNon-billable
- O43.211 Placenta accreta, first trimester
- O43.212 Placenta accreta, second trimester
- O43.213 Placenta accreta, third trimester
- O43.219 Placenta accreta, unspecified trimester
- O43.22 Placenta incretaNon-billable
- O43.221 Placenta increta, first trimester
- O43.222 Placenta increta, second trimester
- O43.223 Placenta increta, third trimester
- O43.229 Placenta increta, unspecified trimester
- O43.23 Placenta percretaNon-billable
- O43.231 Placenta percreta, first trimester
- O43.232 Placenta percreta, second trimester
- O43.233 Placenta percreta, third trimester
- O43.239 Placenta percreta, unspecified trimester
- O43.8 Other placental disordersNon-billable
- O43.81 Placental infarctionNon-billable
- O43.811 Placental infarction, first trimester
- O43.812 Placental infarction, second trimester
- O43.813 Placental infarction, third trimester
- O43.819 Placental infarction, unspecified trimester
- O43.89 Other placental disordersNon-billable
- O43.891 Other placental disorders, first trimester
- O43.892 Other placental disorders, second trimester
- O43.893 Other placental disorders, third trimester
- O43.899 Other placental disorders, unspecified trimester
- O43.9 Unspecified placental disorderNon-billable
- O43.90 Unspecified placental disorder, unspecified trimester
- O43.91 Unspecified placental disorder, first trimester
- O43.92 Unspecified placental disorder, second trimester
- O43.93 Unspecified placental disorder, third trimester
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O43 range.
Circumvallate Placenta
A placenta characterized by fetal membranes that are folded along all or part of the disc perimeter. The amnion may or may not be included in the folded tissue.
Morbidly Adherent Placenta
A condition in which the placenta implants abnormally into the uterine myometrium, rather than implanting into the uterine decidua basalis as is normal.
Placenta Accreta
Abnormal placentation in which all or parts of the PLACENTA are attached directly to the MYOMETRIUM due to a complete or partial absence of DECIDUA. It is associated with POSTPARTUM HEMORRHAGE because of the failure of placental separation.
Placenta Increta
Invasion of CHORIONIC VILLI occurs deep into the MYOMETRIUM.
Placenta Percreta
Invasion of CHORIONIC VILLI occurs through the MYOMETRIUM penetrating the uterine SEROSA.
Placental Infarction
Interruption of the blood supply to a portion of the placenta, resulting in ischemic necrosis.
About the O43 Code Range
Placental problems here include transfusion syndromes, malformations, abnormal adherence, and other placental disorders.
O43.0 separates transfusion between fetus and mother from transfusion between fetuses. O43.1 identifies placental malformations, including circumvallate placenta and velamentous insertion of the umbilical cord. O43.2 distinguishes placenta accreta, increta, and percreta as types of morbidly adherent placenta.
O43.8 includes placental infarction and other placental disorders. O43.9 identifies an unspecified placental disorder by trimester, or when the trimester is unspecified.
Questions About This Page
How many billable codes are in the O43 range?
Of the 65 codes in this range, 48 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the O43 range classify?
The range classifies placental disorders. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
