Z48.22
BillableEncounter for aftercare following kidney transplant
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z48.22 an HCC code?
No. Z48.22 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
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 Z48.22
For Z48.22to 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 Z48.22 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
Z48.22 is the ICD-10-CM diagnosis code for encounter for aftercare following kidney transplant. A follow-up visit for ongoing care and monitoring after receiving a kidney transplant. Z48.22 sits in the ICD-10-CM chapter for factors influencing health status and contact with health services (z00-z99), within the section covering encounters for other specific health care (z40-z53).
Z48.22 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.
Maps to RxHCC 260 for Kidney Transplant Complications, reflecting the specialized medication management and monitoring needs of kidney transplant recipients. This indicates significant pharmaceutical intervention requirements and ongoing clinical complexity. Coders reviewing Z48.22 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC — capturing the correct specificity is the highest-leverage RAF improvement available within accurate coding.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z48.22 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is appropriate for routine transplant surveillance and medication management
- •Do not use if the visit is primarily for acute rejection or graft failure
Clinical Significance
This code indicates ongoing post-transplant care for kidney transplant recipients, representing patients with complex medical needs requiring intensive monitoring and specialized management. Kidney transplant aftercare involves immunosuppression management, rejection surveillance, and monitoring for complications.
Documentation Requirements
- ✓Clear documentation of kidney transplant history
- ✓Specific mention of aftercare or follow-up purpose
- ✓Post-transplant monitoring activities performed
- ✓Assessment of transplant function (creatinine, GFR)
- ✓Immunosuppressive medication management
- ✓Provider specialty (transplant team, nephrology)
- ✓Time interval since transplantation
- ✓Any rejection episodes or complications noted
Commonly Confused Codes
- •Z94.0 — Use for kidney transplant status without active aftercare encounter
- •Z48.21 — Use for heart transplant aftercare instead of kidney
- •Z48.23 — Use for liver transplant aftercare instead of kidney
- •T86.10 — Use when documenting kidney transplant complications/rejection
- •Z49.- codes — Use for dialysis encounters, not transplant aftercare