O31.40X3: Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 3

New code · FY2027

Billable: use this code on claims.

• New code, effective October 1, 2026 (FY2027). Before that, this condition was coded as O31.8X93.

Code breakdown

Coding notes

Excludes2 (from O31)

• delayed delivery of second twin, triplet, etc. (O63.2)
• malpresentation of one fetus or more (O32.9)
• placental transfusion syndromes (O43.0-)

7th character (from O31)

• One of the following 7th characters is to be assigned to each code under category O31. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O31 that has a 7th character of 1 through 9.

7th characters (category O31)

• 0 not applicable or unspecified
• 1 fetus 1
• 2 fetus 2
• 3 fetus 3
• 4 fetus 4
• 5 fetus 5
• 9 other fetus

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All FY2027 ICD-10-CM changes

ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.