Y07.421
BillableFoster mother, perpetrator of maltreatment and neglect
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Y07.421 an HCC code?
No. Y07.421 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
Y07.421 is the ICD-10-CM diagnosis code for foster mother, perpetrator of maltreatment and neglect. A foster mother who has perpetrated maltreatment or neglect of a child in her care. Y07.421 sits in the ICD-10-CM chapter for external causes of morbidity (v00-y99), within the section covering assault (x92-y09).
Y07.421 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 specifically for foster care relationships; distinguish from biological, adoptive, or step-mother.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Y07.421 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code specifically for foster care relationships; distinguish from biological, adoptive, or step-mother
- •Always use with the corresponding abuse or neglect diagnosis code