O30.129
BillableTriplet pregnancy with two or more monoamniotic fetuses, unspecified trimester
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is O30.129 an HCC code?
No. O30.129 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
O30.129 is the ICD-10-CM diagnosis code for triplet pregnancy with two or more monoamniotic fetuses, unspecified trimester. A pregnancy with three fetuses where two or more share the same amniotic sac, but the specific trimester of pregnancy is not documented or specified. O30.129 sits in the ICD-10-CM chapter for pregnancy, childbirth and the puerperium (o00-o9a), within the section covering maternal care related to the fetus and amniotic cavity and possible delivery problems (o30-o48).
O30.129 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Use this code only when trimester information is genuinely unavailable or unclear in the documentation.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for O30.129 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when trimester information is genuinely unavailable or unclear in the documentation
- •Query the provider if possible to obtain trimester information for more specific coding