O23.591
BillableInfection of other part of genital tract in pregnancy, first trimester
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is O23.591 an HCC code?
No. O23.591 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
O23.591 is the ICD-10-CM diagnosis code for infection of other part of genital tract in pregnancy, first trimester. An infection of other parts of the female genital tract (such as the uterus, vagina, or vulva) during the first trimester of pregnancy. O23.591 sits in the ICD-10-CM chapter for pregnancy, childbirth and the puerperium (o00-o9a), within the section covering other maternal disorders predominantly related to pregnancy (o20-o29).
O23.591 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.
Document the specific anatomical location of the infection when possible for clinical clarity.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for O23.591 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document the specific anatomical location of the infection when possible for clinical clarity
- •Verify first trimester dating and ensure the infection is pregnancy-related rather than coincidental