O31.33 is the authoritative medical code for Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester. This classification is used in medical billing and clinical recording to specify the clinical criteria for continuing pregnancy after elective fetal reduction of one fetus or more, third trimester (ICD-10-CM O31.33), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester is a non-billable ICD-10-CM category code O31.33. A more specific billable subcode must be selected for claims submission. Excludes2 (not included here): delayed delivery of second twin, triplet, etc. O63.2; malpresentation of one fetus or more O32.9; placental transfusion syndromes O43.0-. 7th character: 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..
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for O31.33 in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- delayed delivery of second twin, triplet, etc. O63.2
- malpresentation of one fetus or more O32.9
- placental transfusion syndromes O43.0-
Frequently Asked Questions (FAQ) & Clinical Guidance
Can O31.33 be billed directly?
No. O31.33 (Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does O31.33 require a 7th character?
Yes. 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..
Can O31.33 be reported alongside related conditions?
Per official ICD-10-CM Excludes2 instructions, O31.33 and the following are not considered part of each other and may both be reported when both conditions are present: delayed delivery of second twin, triplet, etc. (O63.2); malpresentation of one fetus or more (O32.9); placental transfusion syndromes (O43.0-).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to O31.33 in its code family, with their registry titles.
- O31.33X0 — Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, not applicable or unspecified
- O31.33X1 — Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 1
- O31.33X2 — Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 2
- O31.33X3 — Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 3
- O31.33X4 — Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 4
- O31.33X5 — Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, fetus 5
- O31.33X9 — Continuing pregnancy after elective fetal reduction of one fetus or more, third trimester, other fetus