Z94.0

Kidney transplant status

Z94.0 is a clinical code representing the status of a patient who has undergone a renal transplant. This status code indicates that the patient is currently living with a donor kidney (allograft) and requires ongoing medical management to maintain graft function and prevent rejection. This code is specifically used to denote the presence of the transplant and is distinct from codes used to describe complications or failure of the transplanted organ (such as T86.1-). Clinical management for patients with Z94.0 involves life-long immunosuppressive therapy, frequent monitoring of renal function via serum creatinine and glomerular filtration rate (GFR), and surveillance for common post-transplant complications including hypertension, metabolic bone disease, and opportunistic infections. The use of this code is essential for risk adjustment and for documenting the medical necessity of laboratory tests and immunosuppressant blood-level monitoring.

Clinical Symptoms

  • Stable or baseline serum creatinine levels
  • Adequate urine output for physiological needs
  • Maintenance of normotension or controlled hypertension
  • Absence of graft-site tenderness or swelling
  • Absence of new-onset proteinuria
  • Stability of immunosuppressant therapeutic drug levels
  • Normal electrolyte balance (potassium, bicarbonate, phosphate)
  • Absence of systemic signs of rejection such as fever or malaise

Common Causes

  • End-stage renal disease (ESRD) requiring replacement therapy
  • Diabetic nephropathy (Type 1 or Type 2)
  • Hypertensive nephrosclerosis
  • Autosomal dominant polycystic kidney disease (ADPKD)
  • Chronic glomerulonephritis
  • IgA nephropathy (Berger's disease)
  • Systemic lupus erythematosus (Lupus nephritis)
  • Focal segmental glomerulosclerosis (FSGS)
  • Alport syndrome
  • Congenital anomalies of the kidney and urinary tract (CAKUT)

Documentation & Coding Tips

Distinguish between transplant status and transplant complications.

Example: Patient seen for routine follow-up of a well-functioning left kidney transplant performed in 2022. Current serum creatinine is 1.1 mg/dL. No evidence of graft-versus-host disease or acute rejection. Status: Z94.0 (Kidney transplant status). BillingFocus: Documentation of the transplant as a status code rather than a complication code (T86 series) is necessary when the graft is stable and functioning. RiskAdjustment: This code maps to HCC 186 (Major Organ Transplant Status), signifying high complexity and resource utilization.

Billing Focus: Status versus complication identification

Always document the concurrent stage of Chronic Kidney Disease (CKD) if present.

Example: 72-year-old female with kidney transplant status (Z94.0). Current GFR is 42 mL/min/1.73m2, indicating Chronic Kidney Disease, Stage 3b (N18.32). Graft is stable on current Tacrolimus dosing. BillingFocus: Coding the CKD stage (N18.32) alongside the transplant status (Z94.0) provides specificity regarding the current level of graft function. RiskAdjustment: CKD Stage 3b or higher provides additional risk adjustment weight beyond the transplant status code.

Billing Focus: Specificity of CKD stage secondary to transplant

Document the use of long-term immunosuppressant medications.

Example: Follow-up for kidney transplant status (Z94.0). Patient maintains adherence to Tacrolimus 3mg BID and Mycophenolate 500mg BID. Labs today show stable drug levels. Assessment: Z94.0 and Z79.899 (Other long term drug therapy). BillingFocus: Reporting Z79.899 supports the medical necessity of frequent therapeutic drug monitoring (CPT 80197). RiskAdjustment: Documentation of long-term drug therapy underscores the complexity of managing a transplant recipient.

Billing Focus: Medical necessity for lab monitoring

Specify the origin of the donor organ when relevant to the encounter.

Example: Patient presents for monitoring of a deceased donor kidney transplant status (Z94.0). Graft was received in 2019. Patient is currently asymptomatic with stable renal markers. BillingFocus: While Z94.0 is the primary status code, clinical notes should specify donor type (deceased vs. living) to justify specific screening protocols. RiskAdjustment: High-risk status is maintained as long as the graft is present and functioning.

Billing Focus: Donor source specificity for clinical context

Clearly document the absence of rejection signs during status assessments.

Example: Kidney transplant status (Z94.0) review. Patient denies fever, oliguria, or graft site tenderness. Physical exam reveals no peripheral edema. Creatinine at baseline. No signs of rejection (T86.11) or infection (T86.13) at this time. BillingFocus: Explicitly ruling out T-codes ensures that Z94.0 remains the appropriate primary status diagnosis. RiskAdjustment: Prevents incorrect downcoding or upcoding related to acute complications.

Billing Focus: Negative findings to exclude complication codes

Relevant CPT Codes

Related Diagnoses

Hierarchy