Complications specific to multiple gestation

**Excludes2:** - delayed delivery of second twin, triplet, etc. (O63.2) - malpresentation of one fetus or more (O32.9) - placental transfusion syndromes (O43.0-)

**7th character note:** - One of the following 7th characters is to be assigned to each code under category O31. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O31 that has a 7th character of 1 through 9.

**7th character:** - 0: not applicable or unspecified - 1: fetus 1 - 2: fetus 2 - 3: fetus 3 - 4: fetus 4 - 5: fetus 5 - 9: other fetus