Z91.A98
BillableCaregiver's noncompliance with patient's other medical treatment and regimen for other reason
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z91.A98 an HCC code?
No. Z91.A98 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
Z91.A98 is the ICD-10-CM diagnosis code for caregiver's noncompliance with patient's other medical treatment and regimen for other reason. A caregiver is not following the patient's prescribed medical treatment or care plan for reasons other than those already specified. Z91.A98 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).
Z91.A98 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 as a catch-all code for caregiver non-compliance when the specific reason doesn't fit other Z91.A9x categories.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z91.A98 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this as a catch-all code for caregiver non-compliance when the specific reason doesn't fit other Z91.A9x categories
- •Document the underlying reason in the medical record to support appropriate interventions and care planning