O31 Complications specific to multiple gestation

Delayed delivery of second twin, triplet, etc. (O63.2)

Malpresentation of one fetus or more (O32.9)

Placental transfusion syndromes (O43.0-)

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.

0: not applicable or unspecified

1: fetus 1

2: fetus 2

3: fetus 3

4: fetus 4

5: fetus 5

9: other fetus