ICD-10-CM category
O31 Complications specific to multiple gestation
O31 is a category, not a billable code. Report one of the 140 complete codes below.
O31.0…
28 codes
- O31.00X0Papyraceous fetus, unspecified trimester, not applicable or unspecified
- O31.00X1Papyraceous fetus, unspecified trimester, fetus 1
- O31.00X2Papyraceous fetus, unspecified trimester, fetus 2
- O31.00X3Papyraceous fetus, unspecified trimester, fetus 3
- O31.00X4Papyraceous fetus, unspecified trimester, fetus 4
- O31.00X5Papyraceous fetus, unspecified trimester, fetus 5
- O31.00X9Papyraceous fetus, unspecified trimester, other fetus
- O31.01X0Papyraceous fetus, first trimester, not applicable or unspecified
- O31.01X1Papyraceous fetus, first trimester, fetus 1
- O31.01X2Papyraceous fetus, first trimester, fetus 2
- O31.01X3Papyraceous fetus, first trimester, fetus 3
- O31.01X4Papyraceous fetus, first trimester, fetus 4
- O31.01X5Papyraceous fetus, first trimester, fetus 5
- O31.01X9Papyraceous fetus, first trimester, other fetus
- O31.02X0Papyraceous fetus, second trimester, not applicable or unspecified
- O31.02X1Papyraceous fetus, second trimester, fetus 1
- O31.02X2Papyraceous fetus, second trimester, fetus 2
- O31.02X3Papyraceous fetus, second trimester, fetus 3
- O31.02X4Papyraceous fetus, second trimester, fetus 4
- O31.02X5Papyraceous fetus, second trimester, fetus 5
- O31.02X9Papyraceous fetus, second trimester, other fetus
- O31.03X0Papyraceous fetus, third trimester, not applicable or unspecified
- O31.03X1Papyraceous fetus, third trimester, fetus 1
- O31.03X2Papyraceous fetus, third trimester, fetus 2
- O31.03X3Papyraceous fetus, third trimester, fetus 3
- O31.03X4Papyraceous fetus, third trimester, fetus 4
- O31.03X5Papyraceous fetus, third trimester, fetus 5
- O31.03X9Papyraceous fetus, third trimester, other fetus
O31.1…
28 codes
- O31.10X0Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, not applicable or unspecified
- O31.10X1Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 1
- O31.10X2Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 2
- O31.10X3Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 3
- O31.10X4Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 4
- O31.10X5Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, fetus 5
- O31.10X9Continuing pregnancy after spontaneous abortion of one fetus or more, unspecified trimester, other fetus
- O31.11X0Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, not applicable or unspecified
- O31.11X1Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 1
- O31.11X2Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 2
- O31.11X3Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 3
- O31.11X4Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 4
- O31.11X5Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, fetus 5
- O31.11X9Continuing pregnancy after spontaneous abortion of one fetus or more, first trimester, other fetus
- O31.12X0Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, not applicable or unspecified
- O31.12X1Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 1
- O31.12X2Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 2
- O31.12X3Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 3
- O31.12X4Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 4
- O31.12X5Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, fetus 5
- O31.12X9Continuing pregnancy after spontaneous abortion of one fetus or more, second trimester, other fetus
- O31.13X0Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, not applicable or unspecified
- O31.13X1Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 1
- O31.13X2Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 2
- O31.13X3Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 3
- O31.13X4Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 4
- O31.13X5Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, fetus 5
- O31.13X9Continuing pregnancy after spontaneous abortion of one fetus or more, third trimester, other fetus
O31.2…
28 codes
- O31.20X0Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, not applicable or unspecified
- O31.20X1Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 1
- O31.20X2Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 2
- O31.20X3Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 3
- O31.20X4Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 4
- O31.20X5Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, fetus 5
- O31.20X9Continuing pregnancy after intrauterine death of one fetus or more, unspecified trimester, other fetus
- O31.21X0Continuing pregnancy after intrauterine death of one fetus or more, first trimester, not applicable or unspecified
- O31.21X1Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 1
- O31.21X2Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 2
- O31.21X3Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 3
- O31.21X4Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 4
- O31.21X5Continuing pregnancy after intrauterine death of one fetus or more, first trimester, fetus 5
- O31.21X9Continuing pregnancy after intrauterine death of one fetus or more, first trimester, other fetus
- O31.22X0Continuing pregnancy after intrauterine death of one fetus or more, second trimester, not applicable or unspecified
- O31.22X1Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 1
- O31.22X2Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 2
- O31.22X3Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 3
- O31.22X4Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 4
- O31.22X5Continuing pregnancy after intrauterine death of one fetus or more, second trimester, fetus 5
- O31.22X9Continuing pregnancy after intrauterine death of one fetus or more, second trimester, other fetus
- O31.23X0Continuing pregnancy after intrauterine death of one fetus or more, third trimester, not applicable or unspecified
- O31.23X1Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 1
- O31.23X2Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 2
- O31.23X3Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 3
- O31.23X4Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 4
- O31.23X5Continuing pregnancy after intrauterine death of one fetus or more, third trimester, fetus 5
- O31.23X9Continuing pregnancy after intrauterine death of one fetus or more, third trimester, other fetus
O31.3…
28 codes
- O31.30X0Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, not applicable or unspecified
- O31.30X1Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 1
- O31.30X2Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 2
- O31.30X3Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 3
- O31.30X4Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 4
- O31.30X5Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, fetus 5
- O31.30X9Continuing pregnancy after elective fetal reduction of one fetus or more, unspecified trimester, other fetus
- O31.31X0Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, not applicable or unspecified
- O31.31X1Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 1
- O31.31X2Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 2
- O31.31X3Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 3
- O31.31X4Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 4
- O31.31X5Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, fetus 5
- O31.31X9Continuing pregnancy after elective fetal reduction of one fetus or more, first trimester, other fetus
- O31.32X0Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, not applicable or unspecified
- O31.32X1Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 1
- O31.32X2Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 2
- O31.32X3Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 3
- O31.32X4Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 4
- O31.32X5Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, fetus 5
- O31.32X9Continuing pregnancy after elective fetal reduction of one fetus or more, second trimester, other fetus
- O31.33X0Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, not applicable or unspecified
- O31.33X1Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 1
- O31.33X2Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 2
- O31.33X3Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 3
- O31.33X4Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 4
- O31.33X5Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 5
- O31.33X9Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, other fetus
O31.8…
28 codes
- O31.8X10Other complications specific to multiple gestation, first trimester, not applicable or unspecified
- O31.8X11Other complications specific to multiple gestation, first trimester, fetus 1
- O31.8X12Other complications specific to multiple gestation, first trimester, fetus 2
- O31.8X13Other complications specific to multiple gestation, first trimester, fetus 3
- O31.8X14Other complications specific to multiple gestation, first trimester, fetus 4
- O31.8X15Other complications specific to multiple gestation, first trimester, fetus 5
- O31.8X19Other complications specific to multiple gestation, first trimester, other fetus
- O31.8X20Other complications specific to multiple gestation, second trimester, not applicable or unspecified
- O31.8X21Other complications specific to multiple gestation, second trimester, fetus 1
- O31.8X22Other complications specific to multiple gestation, second trimester, fetus 2
- O31.8X23Other complications specific to multiple gestation, second trimester, fetus 3
- O31.8X24Other complications specific to multiple gestation, second trimester, fetus 4
- O31.8X25Other complications specific to multiple gestation, second trimester, fetus 5
- O31.8X29Other complications specific to multiple gestation, second trimester, other fetus
- O31.8X30Other complications specific to multiple gestation, third trimester, not applicable or unspecified
- O31.8X31Other complications specific to multiple gestation, third trimester, fetus 1
- O31.8X32Other complications specific to multiple gestation, third trimester, fetus 2
- O31.8X33Other complications specific to multiple gestation, third trimester, fetus 3
- O31.8X34Other complications specific to multiple gestation, third trimester, fetus 4
- O31.8X35Other complications specific to multiple gestation, third trimester, fetus 5
- O31.8X39Other complications specific to multiple gestation, third trimester, other fetus
- O31.8X90Other complications specific to multiple gestation, unspecified trimester, not applicable or unspecified
- O31.8X91Other complications specific to multiple gestation, unspecified trimester, fetus 1
- O31.8X92Other complications specific to multiple gestation, unspecified trimester, fetus 2
- O31.8X93Other complications specific to multiple gestation, unspecified trimester, fetus 3
- O31.8X94Other complications specific to multiple gestation, unspecified trimester, fetus 4
- O31.8X95Other complications specific to multiple gestation, unspecified trimester, fetus 5
- O31.8X99Other complications specific to multiple gestation, unspecified trimester, other fetus
Outside the US? O31 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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