FY2027UpcomingSelected edition
Effective from
- Added
Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester
Category — select a more specific code
CDC/NCHS · FY2027code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
supervision of normal pregnancy (Z34.-)
0 — not applicable or unspecified
1 — fetus 1
2 — fetus 2
3 — fetus 3
4 — fetus 4
5 — fetus 5
9 — other fetus
For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.
Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.
Official coding guidelines → · CMS ↗First observed · 2026-10-01
Latest recorded change · FY2027
Effective from
Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester
Category — select a more specific code
CDC/NCHS · FY2027| All editions | Effective from | Code history |
|---|---|---|
| FY2027 | 2026-10-01 | Added |
The official Tabular List has no additional instructions at this code level.
Review the instructions inherited from its parent categories below. Inherited instructions ↓
supervision of normal pregnancy (Z34.-)
code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
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.
0 — not applicable or unspecified
1 — fetus 1
2 — fetus 2
3 — fetus 3
4 — fetus 4
5 — fetus 5
9 — other fetus
O31.43X0Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, not applicable or unspecifiedBillable / specificO31.43X1Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 1Billable / specificO31.43X2Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 2Billable / specificO31.43X3Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 3Billable / specificO31.43X4Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 4Billable / specificO31.43X5Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 5Billable / specificO31.43X9Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, other fetusBillable / specificOther entries in the same category; these are not automatic substitutes.
| Code | Description | Category · further specificity required |
|---|---|---|
| O31.40 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester | Category · further specificity required |
| O31.41 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester | Category · further specificity required |
| O31.42 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester | Category · further specificity required |
Official titles and instructions are preserved in their source language. Official sources ↗