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 2026, 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.
Oligohydramnios
A condition of abnormally low AMNIOTIC FLUID volume. Principal causes include malformations of fetal URINARY TRACT; FETAL GROWTH RETARDATION; GESTATIONAL HYPERTENSION; nicotine poisoning; and PROLONGED PREGNANCY.
About the O42 Code Range
ICD-10 code O42 covers various types of premature rupture of membranes (PROM), a condition where the amniotic sac breaks before labor begins. These codes specify the timing of labor onset relative to membrane rupture and the pregnancy trimester.
This section includes codes for PROM with labor starting within 24 hours (e.g., O42.0), after 24 hours (e.g., O42.1), or when the timing is unspecified (e.g., O42.9). It distinguishes between preterm premature rupture of membranes (PPROM), which occurs before 37 weeks of gestation, and full-term PROM, occurring at or after 37 weeks. Subcodes such as O42.011 to O42.913 indicate specific trimesters or unspecified gestational ages. Synonyms like "prem rupture of membranes onset of labor within 24 hours," "prolonged rupture of membranes," and "amniotic fluid leaking" help clarify common terms mapped to these codes. These specific ICD-10-CM codes enable precise classification of PROM cases for accurate diagnosis and healthcare documentation.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
