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021 Conjoined twins, first trimester
- O30.022 Conjoined twins, second trimester
- O30.023 Conjoined twins, third trimester
- O30.029 Conjoined twins, unspecified trimester
- O30.09 Other twin pregnancy
- O30.091 Other twin pregnancy, first trimester
- O30.092 Other twin pregnancy, second trimester
- O30.093 Other twin pregnancy, third trimester
- O30.099 Other twin pregnancy, unspecified trimester
- O30.1 Triplet pregnancy
- O30.10 Triplet pregnancy, unspecified trimester
- O30.11 Triplet pregnancy, first trimester
- O30.12 Triplet pregnancy, second trimester
- O30.13 Triplet pregnancy, third trimester
- O30.2 Quadruplet pregnancy
- O30.20 Quadruplet pregnancy, unspecified trimester
- O30.21 Quadruplet pregnancy, first trimester
- O30.22 Quadruplet pregnancy, second trimester
- O30.23 Quadruplet pregnancy, third trimester
- O30.8 Other multiple gestation
- O30.80 Other multiple gestation, unspecified trimester
- O30.81 Other multiple gestation, first trimester
- O30.82 Other multiple gestation, second trimester
- O30.83 Other multiple gestation, third trimester
- O30.9 Multiple gestation, unspecified
- Multiple pregnancy NOS
- O30.90 Multiple gestation, unspecified, unspecified trimester
- O30.91 Multiple gestation, unspecified, first trimester
- O30.92 Multiple gestation, unspecified, second trimester
- O30.93 Multiple gestation, unspecified, third trimester
O31 Complications specific to multiple gestation
- Excludes2: delayed delivery of second twin, triplet, etc. (O63.2)
- malpresentation of one fetus or more (O32.5)
- 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
