O31Complications specific to multiple gestation

O31 is the ICD-10-CM diagnosis code for complications specific to multiple gestation. It belongs to block O30-O48 (maternal care related to the fetus and amniotic cavity and possible delivery problems) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: O31.0 (fetus), O31.1 (more), O31.2 (more), O31.3 (more), O31.4 (more) and O31.8 (gestation).

The conditions in its Excludes2 note aren't part of O31, but may be coded alongside it if the patient has both: delayed delivery of second twin, triplet, etc. (O63.2), malpresentation of one fetus or more (O32.9) and placental transfusion syndromes (O43.0-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.