Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester
Under O31.4 Continuing pregnancy after vanishing twin syndrome of one fetus or more, in Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48), chapter 15: Pregnancy, Childbirth and the Puerperium
7 billable codes under O31.43: none are a CC or MCC; none map to an HCC.
Instructional notes
Also applies, from O31: Complications specific to multiple gestation
These notes sit on O31 and apply to every code under it, including O31.43.
All codes under O31.43
O31.43 can't be used on a claim. Pick a billable code below; grey headings group them.
- O31.43X0Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, not applicable or unspecified
- O31.43X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 1
- O31.43X2Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 2
- O31.43X3Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 3
- O31.43X4Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 4
- O31.43X5Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 5
- O31.43X9Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, other fetus
MS-DRGs
As the principal diagnosis, all 7 billable codes under O31.43 group to these MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 817 Other Antepartum Diagnoses with O.R. Procedures with MCC
- DRG 818 Other Antepartum Diagnoses with O.R. Procedures with CC
- DRG 819 Other Antepartum Diagnoses with O.R. Procedures without CC/MCC
- DRG 831 Other Antepartum Diagnoses without O.R. Procedures with MCC
- DRG 832 Other Antepartum Diagnoses without O.R. Procedures with CC
- DRG 833 Other Antepartum Diagnoses without O.R. Procedures without CC/MCC
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Twins, Triplets, Multiple Births
If you are pregnant with more than one baby, you are far from alone. Multiple births are up in the United States. More women are having babies after age 30 and more are taking fertility drugs. Both boost the chance of carrying more than one baby. A family history of twins also makes multiples more likely.
Read more about twins, triplets, multiple births on MedlinePlusCode history
Added in FY2027 (effective October 1, 2026). No changes since.