| O42 | Premature rupture of membranes | NON-BILLABLE CODE |
| O42.0 | Premature rupture of membranes, onset of labor within 24 hours of rupture | NON-BILLABLE CODE |
| O42.00 | Premature rupture of membranes, onset of labor within 24 hours of rupture, unspecified weeks of gestation | BILLABLE CODE |
| O42.01 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture | NON-BILLABLE CODE |
| O42.011 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, first trimester | BILLABLE CODE |
| O42.012 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, second trimester | BILLABLE CODE |
| O42.013 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, third trimester | BILLABLE CODE |
| O42.019 | Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, unspecified trimester | BILLABLE CODE |
| O42.1 | Premature rupture of membranes, onset of labor more than 24 hours following rupture | NON-BILLABLE CODE |
| O42.10 | Premature rupture of membranes, onset of labor more than 24 hours following rupture, unspecified weeks of gestation | BILLABLE CODE |
| O42.11 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture | NON-BILLABLE CODE |
| O42.111 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, first trimester | BILLABLE CODE |
| O42.112 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, second trimester | BILLABLE CODE |
| O42.113 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, third trimester | BILLABLE CODE |
| O42.119 | Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, unspecified trimester | BILLABLE CODE |
| O42.12 | Full-term premature rupture of membranes, onset of labor more than 24 hours following rupture | BILLABLE CODE |
| O42.9 | Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor | NON-BILLABLE CODE |
| O42.90 | Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified weeks of gestation | BILLABLE CODE |
| O42.91 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor | NON-BILLABLE CODE |
| O42.911 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, first trimester | BILLABLE CODE |
| O42.912 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, second trimester | BILLABLE CODE |
| O42.913 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, third trimester | BILLABLE CODE |
| O42.919 | Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified trimester | BILLABLE CODE |
| O42.92 | Full-term premature rupture of membranes, unspecified as to length of time between rupture and onset of labor | BILLABLE CODE |
