ICD-10-CM>O00-O9A>O30-O48>O31>O31.4O31.4Continuing pregnancy after vanishing twin syndrome of one fetus or moreNon-Billable/Non-SpecificCodesO31.40Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimesterO31.40X0..., not applicable or unspecifiedO31.40X1..., fetus 1O31.40X2..., fetus 2O31.40X3..., fetus 3O31.40X4..., fetus 4O31.40X5..., fetus 5O31.40X9..., other fetusO31.41Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimesterO31.41X0..., not applicable or unspecifiedO31.41X1..., fetus 1O31.41X2..., fetus 2O31.41X3..., fetus 3O31.41X4..., fetus 4O31.41X5..., fetus 5O31.41X9..., other fetusO31.42Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimesterO31.42X0..., not applicable or unspecifiedO31.42X1..., fetus 1O31.42X2..., fetus 2O31.42X3..., fetus 3O31.42X4..., fetus 4O31.42X5..., fetus 5O31.42X9..., other fetusO31.43Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimesterO31.43X0..., not applicable or unspecifiedO31.43X1..., fetus 1O31.43X2..., fetus 2O31.43X3..., fetus 3O31.43X4..., fetus 4O31.43X5..., fetus 5O31.43X9..., other fetus