Z48.280
BillableEncounter for aftercare following heart-lung transplant
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z48.280 an HCC code?
Yes. Z48.280 maps to Major Organ Transplant or Replacement 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 Z48.280
For Z48.280 to 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 Z48.280 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
Z48.280 is the ICD-10-CM diagnosis code for encounter for aftercare following heart-lung transplant. A follow-up visit for ongoing care and monitoring after receiving both a heart and lung transplant. Z48.280 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).
Under the older CMS-HCC V24 model, Z48.280 maps to Major Organ Transplant or Replacement Status (HCC 186) with a community, non-dual, aged base RAF weight of 0.910. 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 specific code for heart-lung combination transplants, not separate heart and lung codes. Because Z48.280 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 Z48.280 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this specific code for heart-lung combination transplants, not separate heart and lung codes
- •Document the date of transplant and any current immunosuppressive regimen
Clinical Significance
This code indicates ongoing post-transplant care for heart-lung transplant recipients, representing patients with the most complex medical needs requiring intensive monitoring and specialized management. Combined organ transplant aftercare involves coordinated immunosuppression management and multi-system monitoring.
Documentation Requirements
- ✓Clear documentation of combined heart-lung transplant history
- ✓Specific mention of aftercare or follow-up purpose
- ✓Post-transplant monitoring activities for both organs
- ✓Assessment of both cardiac and pulmonary function
- ✓Immunosuppressive medication management
- ✓Provider specialty (transplant team, cardiothoracic)
- ✓Time interval since transplantation
- ✓Any rejection episodes or complications in either organ system