Z91.A58
BillableCaregiver's noncompliance with patient's renal dialysis for other reason
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z91.A58 an HCC code?
Yes. Z91.A58 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.A58
For Z91.A58to 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.A58 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
Z91.A58 is the ICD-10-CM diagnosis code for caregiver's noncompliance with patient's renal dialysis for other reason. A caregiver is not following the patient's prescribed kidney dialysis treatment plan for reasons other than those already specified. Z91.A58 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.A58 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.
Use this code when documenting caregiver non-adherence to dialysis specifically; ensure the reason doesn't fit other Z91.A5x subcategories. Because Z91.A58 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.A58 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code when documenting caregiver non-adherence to dialysis specifically; ensure the reason doesn't fit other Z91.A5x subcategories
- •This is a Z code indicating a factor influencing health status; it should not be used as a primary diagnosis for treatment but rather as a secondary code
Clinical Significance
This code captures caregiver-related barriers to patient's dialysis treatment that are not financial in nature, such as caregiver burnout, transportation issues, or psychological factors. These barriers significantly impact patient outcomes and require targeted interventions addressing caregiver support systems.
Documentation Requirements
- ✓Clear documentation of patient's dialysis noncompliance
- ✓Identification of caregiver as responsible party
- ✓Specific non-financial reasons for caregiver noncompliance
- ✓Examples: burnout, transportation, work conflicts, psychological issues
- ✓Documentation of missed or incomplete dialysis sessions
- ✓Caregiver's role and responsibilities clearly defined
- ✓Assessment of caregiver support needs
- ✓Interventions to address caregiver barriers