Premature rupture of membranes (O42) ICD-10-CM
The O42 code range covers premature rupture of membranes with 25 ICD-10-CM diagnosis codes. 18 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the O42 Range 25 codes · 18 billable
- O42 Premature rupture of membranesNon-billable
- O42.0 Premature rupture of membranes, onset of labor within 24 hours of ruptureNon-billable
- O42.00 Premature rupture of membranes, onset of labor within 24 hours of rupture, unspecified weeks of gestation
- O42.01 Preterm premature rupture of membranes, onset of labor within 24 hours of ruptureNon-billable
- O42.011 Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, first trimester
- O42.012 Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, second trimester
- O42.013 Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, third trimester
- O42.019 Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, unspecified trimester
- O42.02 Full-term premature rupture of membranes, onset of labor within 24 hours of rupture
- O42.1 Premature rupture of membranes, onset of labor more than 24 hours following ruptureNon-billable
- O42.10 Premature rupture of membranes, onset of labor more than 24 hours following rupture, unspecified weeks of gestation
- O42.11 Preterm premature rupture of membranes, onset of labor more than 24 hours following ruptureNon-billable
- O42.111 Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, first trimester
- O42.112 Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, second trimester
- O42.113 Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, third trimester
- O42.119 Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, unspecified trimester
- O42.12 Full-term premature rupture of membranes, onset of labor more than 24 hours following rupture
- O42.9 Premature rupture of membranes, unspecified as to length of time between rupture and onset of laborNon-billable
- O42.90 Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified weeks of gestation
- O42.91 Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of laborNon-billable
- O42.911 Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, first trimester
- O42.912 Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, second trimester
- O42.913 Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, third trimester
- O42.919 Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified trimester
- O42.92 Full-term premature rupture of membranes, unspecified as to length of time between rupture and onset of labor
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O42 range.
Premature Rupture of Membrane
Spontaneous rupture of fetal membranes that occurs before the onset of labor. If rupture occurs before 37 weeks of gestation then the correct diagnosis is preterm premature rupture of membranes.
Preterm Premature Rupture of Membrane
Spontaneous rupture of fetal membranes that occurs before the onset of labor and before 37 weeks.
About the O42 Code Range
Premature rupture of membranes means the membranes around the fetus break on their own before labor begins.
The categories first distinguish when labor begins after the rupture: within 24 hours (O42.0), more than 24 hours later (O42.1), or after an unspecified interval (O42.9). Each timing group then separates preterm rupture, full-term rupture, and rupture with unspecified weeks of gestation. Preterm codes divide further by first, second, third, or unspecified trimester.
Questions About This Page
How many billable codes are in the O42 range?
Of the 25 codes in this range, 18 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the O42 range classify?
The range classifies premature rupture of membranes. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
