O42.9Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor

O42.9 is the ICD-10-CM diagnosis code for premature rupture of membranes, unspecified as to length of time between rupture and onset of labor. It belongs to category O42 (premature rupture of membranes), 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 3 subcodes must be used instead.

Within O42, choose O42.9 (unspecified as to length of time between rupture and onset of labor) only when documentation doesn't support a more specific option: onset of labor within 24 hours of rupture (O42.0) and onset of labor more than 24 hours following rupture (O42.1).

To report this condition, pick the subcode that matches the documentation: O42.90 (unspecified weeks of gestation), O42.91 (labor) and O42.92 (labor).

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