CPT 81560 Pediatric Rejection Risk Reimbursement

CPT code 81560 represents a laboratory-developed molecular assay and algorithm (MAAA) that quantifies CD154+ T–cytotoxic memory cell responses to donor and third‑party leukocytes to generate a risk score for allograft rejection in pediatric liver and small‑bowel transplant patients. Nationally, this code is important for transplant centers, pediatric specialists, and clinical laboratories evaluating immune-mediated rejection risk where tailored monitoring can influence post‑transplant surveillance.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical context for use of the assay, how the service aligns with laboratory and outpatient hospital settings, and what payers typically consider when covering MAAA services. The publication outlines common billing considerations, expected sites of service, and the assay’s role in pediatric transplant care pathways.

This summary also prepares readers to interpret benchmarks and policy notes related to novel algorithm-linked laboratory tests: it identifies where coverage guidance and documentation expectations typically apply, highlights operational implications for laboratories and transplant programs, and summarizes the clinical rationale for measuring CD154+ T–cytotoxic memory cell responses in pediatric liver and small bowel rejection assessment.

Billing Code Overview

CPT code 81560 describes a laboratory-developed molecular assay and associated algorithmic analysis used to assess the risk of allograft rejection in pediatric liver or small–bowel transplant patients. The test measures levels of CD154+ T–cytotoxic memory cells after incubating the patient’s blood specimen with organ-donor and third-party leukocytes, and the MAAA produces a rejection risk score specific to pediatric liver or small bowel transplant recipients.

Service Type: Laboratory immunologic assay with algorithmic risk scoring (MAAA)

Typical Site of Service: Clinical laboratory or hospital outpatient laboratory

Clinical Context

A pediatric liver or small–bowel transplant recipient (age 1–17 years) presents for routine post–transplant surveillance or for evaluation of suspected acute graft dysfunction (elevated liver enzymes, cholestasis, fever, or nonspecific GI symptoms). The transplant hepatology team orders a specialized immunologic blood assay to assess risk of allograft rejection. A phlebotomy specimen is collected in the outpatient infusion center, transplant clinic, or hospital inpatient unit and sent to a reference immunology laboratory. The laboratory performs an assay that incubates the patient’s peripheral blood with donor and third–party leukocytes, measures the proportion of CD154+ T–cytotoxic memory cells, and runs an algorithm that integrates the assay result (and optionally clinical variables) to produce a rejection risk score specific to pediatric liver or small–bowel transplants. Results are reported to the transplant physician or advanced practice provider, who incorporates the risk score into clinical decision-making (e.g., adjust immunosuppression, request biopsy, or increase monitoring). Typical sites of service include outpatient transplant clinic, hospital inpatient ward, and reference laboratory. Service type: laboratory diagnostic test with an associated multianalyte algorithmic analysis (MAAA).

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional interpretation component separate from the technical lab processing.

Taxonomy Code	Specialty	Notes
207RH0000X	Pediatric Transplant Hepatology	Physician specialty managing pediatric liver transplant patients and ordering this MAAA.
2080P0207X	Pediatric Gastroenterology	Common ordering specialty for small–bowel transplant surveillance and interpretation of results.
207L00000X	Clinical Pathology	Laboratory physicians overseeing testing and interpretation of specialized immunologic assays.
3336P0806X	Clinical Laboratory Science	Laboratory specialists performing technical components and quality control.
363L00000X	Immunology	Specialists involved in assay development and interpretation of immune–monitoring tests.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`T86.40`	Graft failure and rejection of liver, unspecified	Directly indicates liver graft rejection, primary clinical indication for immune monitoring.
`T86.41`	Acute graft rejection of liver	Represents acute liver allograft rejection where assay helps assess immunologic activity.
`T86.50`	Graft failure and rejection of small bowel, unspecified	Relevant for small–bowel transplant recipients undergoing rejection surveillance.
`T86.51`	Acute graft rejection of small bowel	Used when acute small–bowel rejection is suspected and risk scoring informs management.
`Z94.4`	Liver transplant status	Denotes patient is a liver transplant recipient for routine post–transplant surveillance.
`Z94.83`	Intestine transplant status	Denotes patient is a small–bowel transplant recipient for surveillance or evaluation.
`R74.0`	Nonspecific elevation of levels of transaminase and transaminase	Common clinical trigger (abnormal liver enzymes) prompting rejection testing.
`R65.1`	Systemic inflammatory response syndrome (SIRS) of infectious origin	Systemic signs that may mimic rejection and require immune assessment.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36415`	Collection of venous blood by venipuncture	Specimen collection required prior to performing the assay.
`82784`	Tacrolimus (FK506) or cyclosporine, whole blood; immunosuppressant drug level assay	Immunosuppressant drug levels commonly ordered alongside immune monitoring to correlate drug exposure with rejection risk.
`88305`	Level IV surgical pathology, gross and microscopic examination	If the rejection risk score prompts an allograft biopsy, pathology codes such as this are used for tissue interpretation.
`86152`	Antibody; infectious agent detection by enzyme assay, immunoassay technique, multiple types	Represents other specialized immunoassays that may be performed in parallel (e.g., donor–specific antibody testing).
`81479`	Unlisted molecular pathology procedure	Used when a specific molecular/algorithmic test does not have an assigned CPT code; historically applied to novel or custom algorithmic tests when appropriate.

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Summary & Overview

CPT 81560: Pediatric Liver and Small‑Bowel Allograft Rejection Risk Assay