Y78.8
BillableMiscellaneous radiological devices associated with adverse incidents, not elsewhere classified
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Y78.8 an HCC code?
No. Y78.8 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
Y78.8 is the ICD-10-CM diagnosis code for miscellaneous radiological devices associated with adverse incidents, not elsewhere classified. An adverse event or injury caused by other types of radiation devices not specifically classified elsewhere. Y78.8 sits in the ICD-10-CM chapter for external causes of morbidity (v00-y99), within the section covering medical devices associated with adverse incidents in diagnostic and therapeutic use (y70-y82).
Y78.8 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 as a catch-all code only when the specific type of radiological device cannot be categorized in Y78.0-Y78.3.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Y78.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.