Z91.A51
BillableCaregiver's noncompliance with patient's renal dialysis due to financial hardship
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z91.A51 an HCC code?
Yes. Z91.A51 maps to Dialysis Status under the V24 model but is not retained in V28.
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for Z91.A51
For Z91.A51to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed Z91.A51 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
Z91.A51 is the ICD-10-CM diagnosis code for caregiver's noncompliance with patient's renal dialysis due to financial hardship. A caregiver is not ensuring the patient receives their prescribed kidney dialysis treatments because of financial hardship. Z91.A51 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).
Under the older CMS-HCC V24 model, Z91.A51 maps to Dialysis Status (HCC 134) with a community, non-dual, aged base RAF weight of 0.452. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
This code is specific to dialysis noncompliance; use it only when dialysis is the treatment in question. Because Z91.A51 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z91.A51 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is specific to dialysis noncompliance; use it only when dialysis is the treatment in question.
- •Document the financial barriers and the impact on the patient's renal condition in the medical record.
Clinical Significance
This code identifies when caregiver financial hardship creates barriers to patient's life-sustaining dialysis treatment, representing a critical threat to patient survival. This situation requires immediate social work intervention and may indicate need for emergency financial assistance or alternative care arrangements.
Documentation Requirements
- ✓Clear documentation of patient's dialysis noncompliance
- ✓Identification of caregiver as responsible party
- ✓Specific documentation of caregiver's financial hardship
- ✓Evidence of caregiver's inability to support treatment costs
- ✓Documentation of missed or incomplete dialysis sessions
- ✓Caregiver's role in patient's care clearly defined
- ✓Financial barriers preventing caregiver assistance
- ✓Social work assessment and interventions