Z36.87
BillableEncounter for antenatal screening for uncertain dates
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z36.87 an HCC code?
No. Z36.87 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
Z36.87 is the ICD-10-CM diagnosis code for encounter for antenatal screening for uncertain dates. A prenatal visit where ultrasound is used to confirm or establish the due date when the mother's last menstrual period is unknown or unreliable. Z36.87 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).
Z36.87 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 dating method used and the established gestational age; this is often the first trimester dating scan.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z36.87 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document the dating method used and the established gestational age; this is often the first trimester dating scan
- •Use this code when dating is the primary purpose of the encounter, not as a secondary finding