O60.1 Preterm labor with preterm delivery

7th character: One of the following 7th characters is to be assigned to each code under subcategory O60.1. 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 subcategory O60.1 that has a 7th character of 1 through 9.
7th character definitions: not applicable or unspecified
fetus 1
fetus 2
fetus 3
fetus 4
fetus 5
other fetus