Z3A.23
Billable23 weeks gestation of pregnancy
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z3A.23 an HCC code?
No. Z3A.23 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
Z3A.23 is the ICD-10-CM diagnosis code for 23 weeks gestation of pregnancy. A pregnancy that is 23 weeks along, near the threshold of fetal viability when the fetus is approximately 11-12 inches long and weighs about 1.1 pounds. Z3A.23 sits in the ICD-10-CM chapter for factors influencing health status and contact with health services (z00-z99), within the section covering persons encountering health services in circumstances related to reproduction (z30-z39).
Z3A.23 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 any viability assessments, fetal monitoring, or discussions about prematurity at this critical gestational age.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z3A.23 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document any viability assessments, fetal monitoring, or discussions about prematurity at this critical gestational age
- •Ensure accurate dating to distinguish between 22 and 23 weeks, as this affects viability considerations