Vanishing Twin Syndrome

A new subcategory O31.4 , Continuing pregnancy after vanishing twin syndrome of one fetus or more, has been created with codes to identify vanishing twin syndrome (VTS) occurring during pregnancy. The new codes in this subcategory require a seventh character: O31.40 - Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester O31.41 - Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester   O31.42 - Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester O31.43 - Continuing pregnancy after vanishing twin syndrome of...

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