O31 — Complications specific to multiple gestation
Part of Chapter 15: Pregnancy, childbirth and the puerperium , block Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48) .
Official Notes
Excludes2
delayed delivery of second twin, triplet, etc. ( O63.2 )
Excludes2
malpresentation of one fetus or more ( O32.9 )
Excludes2
placental transfusion syndromes ( O43.0- )
7th Character
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
7th Character
1 - fetus 1
7th Character
2 - fetus 2
7th Character
3 - fetus 3
7th Character
4 - fetus 4
7th Character
5 - fetus 5
7th Character
9 - other fetus
Child Codes
- O31.0 Papyraceous fetus Has subcodes
- O31.1 Continuing pregnancy after spontaneous abortion of one fetus or more Has subcodes
- O31.2 Continuing pregnancy after intrauterine death of one fetus or more Has subcodes
- O31.3 Continuing pregnancy after elective fetal reduction of one fetus or more Has subcodes
- O31.4 Continuing pregnancy after vanishing twin syndrome of one fetus or more Has subcodes
- O31.8 Other complications specific to multiple gestation Has subcodes
FY 2027 effective October 1, 2026 · CDC NCHS and CMS