Is ICD-10-CM code O31.42X5 billable?

Yes, O31.42X5 (Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 5) is a billable ICD-10-CM diagnosis code, valid for reimbursement on HIPAA-covered transactions for FY2027.

What chapter does ICD-10-CM code O31.42X5 belong to?

O31.42X5 belongs to Chapter 15 of the ICD-10-CM tabular list: O00–O9A (Pregnancy, Childbirth and the Puerperium).

Is O31.42X5 a new ICD-10-CM code for 2027?

Yes, O31.42X5 was added or revised in the FY2027 ICD-10-CM update, effective October 1, 2026, as published by the Centers for Medicare and Medicaid Services (CMS).

O31.42X5Billable, valid for claims from October 1, 2026New for FY2027

Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 5

Under O31.42 Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, in Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48), chapter 15: Pregnancy, Childbirth and the Puerperium

O31.42X5 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under O31.42 below.
As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
Expected only on maternity records. (Maternity list)

Instructional notes

Also applies, from O31: Complications specific to multiple gestation

These notes sit on O31 and apply to every code under it, including O31.42X5.

Excludes2: not included here, code separately if applicable

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

Other codes under O31.42

Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester

O31.42X0Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, not applicable or unspecified
O31.42X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 1
O31.42X2Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 2
O31.42X3Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 3
O31.42X4Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 4
O31.42X5Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 5(this code)
O31.42X9Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, other fetus

MS-DRGs

As the principal diagnosis, this code groups 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.

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.

Code history

Added in FY2027 (effective October 1, 2026). Before that, these cases were coded as O31.8X25 (Other complications specific to multiple gestation, second trimester, fetus 5). No changes since.