O34.591
BillableMaternal care for other abnormalities of gravid uterus, first trimester
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is O34.591 an HCC code?
No. O34.591 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
O34.591 is the ICD-10-CM diagnosis code for maternal care for other abnormalities of gravid uterus, first trimester. Pregnant patient receiving care for other structural problems or abnormalities of the uterus during the first trimester. O34.591 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).
O34.591 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.
This is a catch-all code for uterine abnormalities not classified elsewhere; document the specific abnormality in the medical record.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for O34.591 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a catch-all code for uterine abnormalities not classified elsewhere; document the specific abnormality in the medical record
- •Ensure first trimester timing is clearly documented to support this code selection