Z89.522
BillableAcquired absence of left knee
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z89.522 an HCC code?
No. Z89.522 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
Z89.522 is the ICD-10-CM diagnosis code for acquired absence of left knee. A person who has lost their left knee due to amputation or surgical removal. This is a permanent condition affecting mobility and may require prosthetic devices. Z89.522 sits in the ICD-10-CM chapter for factors influencing health status and contact with health services (z00-z99), within the section covering persons with potential health hazards related to family and personal history and certain conditions influencing health status (z77-z99).
Z89.522 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 for acquired absence (not congenital); verify the amputation was due to trauma, disease, or surgery.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z89.522 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only for acquired absence (not congenital); verify the amputation was due to trauma, disease, or surgery
- •Pair with codes for prosthetic fitting (Z44.3) or rehabilitation if applicable