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ICD-10-CM · FY 2026 APRIL UPDATE

O31.4

Continuing pregnancy after vanishing twin syndrome of one fetus or more

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
O31.40Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimesterCategory
O31.40X0Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, not applicable or unspecifiedBillable
O31.40X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 1Billable
O31.40X2Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 2Billable
O31.40X3Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 3Billable
O31.40X4Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 4Billable
O31.40X5Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 5Billable
O31.40X9Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, other fetusBillable
O31.41Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimesterCategory
O31.41X0Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, not applicable or unspecifiedBillable
O31.41X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 1Billable
O31.41X2Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 2Billable
O31.41X3Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 3Billable
O31.41X4Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 4Billable
O31.41X5Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 5Billable
O31.41X9Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, other fetusBillable
O31.42Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimesterCategory
O31.42X0Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, not applicable or unspecifiedBillable
O31.42X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 1Billable
O31.42X2Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 2Billable
O31.42X3Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 3Billable
O31.42X4Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 4Billable
O31.42X5Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 5Billable
O31.42X9Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, other fetusBillable
O31.43Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimesterCategory
O31.43X0Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, not applicable or unspecifiedBillable
O31.43X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 1Billable
O31.43X2Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 2Billable
O31.43X3Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 3Billable
O31.43X4Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 4Billable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.