One of the following 7th characters is to be assigned to each code under category O41. 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 O41 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 |
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