ICD-10-CM 2027 diagnosis code
O42Premature rupture of membranes
O42 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About O42
O42 is the ICD-10-CM diagnosis code for premature rupture of membranes. 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 3 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: O42.0 (onset of labor within 24 hours of rupture), O42.1 (onset of labor more than 24 hours following rupture) and O42.9 (unspecified as to length of time between rupture and onset of labor).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under O42
- O42.0Premature rupture of membranes, onset of labor within 24 hours of rupture
- O42.00Premature rupture of membranes, onset of labor within 24 hours of rupture, unspecified weeks of gestationBillable
- O42.01Preterm premature rupture of membranes, onset of labor within 24 hours of rupture
- O42.011Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, first trimesterBillable
- O42.012Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, second trimesterBillable
- O42.013Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, third trimesterBillable
- O42.019Preterm premature rupture of membranes, onset of labor within 24 hours of rupture, unspecified trimesterBillable
- O42.02Full-term premature rupture of membranes, onset of labor within 24 hours of ruptureBillable
- O42.1Premature rupture of membranes, onset of labor more than 24 hours following rupture
- O42.10Premature rupture of membranes, onset of labor more than 24 hours following rupture, unspecified weeks of gestationBillable
- O42.11Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture
- O42.111Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, first trimesterBillable
- O42.112Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, second trimesterBillable
- O42.113Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, third trimesterBillable
- O42.119Preterm premature rupture of membranes, onset of labor more than 24 hours following rupture, unspecified trimesterBillable
- O42.12Full-term premature rupture of membranes, onset of labor more than 24 hours following ruptureBillable
- O42.9Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor
- O42.90Premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified weeks of gestationBillable
- O42.91Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor
- O42.911Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, first trimesterBillable
- O42.912Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, second trimesterBillable
- O42.913Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, third trimesterBillable
- O42.919Preterm premature rupture of membranes, unspecified as to length of time between rupture and onset of labor, unspecified trimesterBillable
- O42.92Full-term premature rupture of membranes, unspecified as to length of time between rupture and onset of laborBillable
Notes that apply from higher levels
Instructions written at a parent level also apply to O42.
Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.
Alphabetic index entries
3 entriesTerms in the official ICD-10-CM index that lead to O42.
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › oligohydramnios › with premature rupture of membranes
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › rupture › amnion (premature)
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › rupture › membranes (premature)
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about O42
Is O42 billable?
- No. O42 is a header code. Report one of its more specific subcodes instead.