Summary & Overview

CPT 0541U: HDL Reverse Cholesterol Transport Panel with pCAD Score

CPT code 0541U designates a Proprietary Laboratory Analyses (PLA) test: the HDL Reverse Cholesterol Transport Panel with pCAD Score from Quest Diagnostics®. The assay measures cholesterol efflux capacity by quantifying five proteins bound to HDL using liquid chromatography–mass spectrometry/mass spectrometry (LC–MS/MS) and reports a predicted coronary artery disease (pCAD) score. This specialized, single-manufacturer test is intended to augment cardiovascular risk assessment beyond traditional lipid panels.

Key national payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical purpose and laboratory methodology of the test, payer coverage landscape, common billing considerations (including typical modifiers), and the service settings where the test is performed. The publication summarizes benchmarks and policy-relevant issues for PLA-coded laboratory diagnostics, clarifies coding semantics for 0541U, and provides context for how this test fits into cardiovascular risk evaluation. Data not provided in the input are noted as unavailable. This summary is intended for national audiences including payers, lab billing teams, and clinicians seeking concise policy and billing context for CPT code 0541U.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare0541UCPTProprietary Laboratory AnalysesHDL reverse cholesterol transportpCAD scoreLC-MS/MScardiovascular risklaboratory testing

Billing Code Overview

CPT code 0541U is a Proprietary Laboratory Analyses (PLA) code that applies to a single, manufacturer- or lab-specific test. Report 0541U only for the HDL Reverse Cholesterol Transport Panel with pCAD Score performed by Quest Diagnostics®. The test evaluates cardiovascular disease risk by measuring cholesterol efflux capacity — how effectively high–density lipoprotein (HDL) removes cholesterol from cells — and reports a prediction score for coronary artery disease (pCAD).

Service type: Laboratory test (PLA)

Typical site of service: Clinical laboratory / reference laboratory

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A 56-year-old patient with intermediate cardiovascular risk on traditional lipid panel and clinical risk scoring presents for further risk stratification. The clinician orders the 0541U HDL Reverse Cholesterol Transport Panel with pCAD Score from Quest Diagnostics® to assess HDL cholesterol efflux capacity and derived pCAD prediction. Blood is collected in an ambulatory outpatient laboratory or hospital outpatient draw station; specimen is sent to the vendor laboratory for LC–MS/MS protein quantification and pCAD algorithm reporting. Results return as a numeric pCAD score with interpretation used by the ordering provider to refine coronary artery disease risk assessment and guide shared decision-making on preventive therapies and surveillance.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	When additional work or documentation demonstrates substantially greater effort or complexity beyond the typical assay interpretation or reporting burden for `0541U`.
`52`

Taxonomy Code	Specialty	Notes
2084P0800X	Clinical Laboratory	Clinical pathologists and laboratory directors overseeing specialized assays.
207RP1001X	Cardiology	Cardiologists ordering advanced cardiovascular risk stratification tests.
207Q00000X	Preventive Medicine	Preventive medicine specialists using biomarker-based risk prediction.
363LP0200X	Phlebotomy	Phlebotomists and outpatient drawing services performing specimen collection.
207K00000X	Internal Medicine	Primary care internists managing chronic cardiovascular risk who order the test.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`E78.5`	Hyperlipidemia, unspecified	Common indication for advanced lipid and HDL functional testing when standard lipid abnormalities are present.
`I25.10`	Atherosclerotic heart disease of native coronary artery without angina pectoris	Used when assessing residual coronary disease risk or progression via HDL function testing.
`Z13.6`	Encounter for screening for cardiovascular disorders	Applicable when `0541U` is used for enhanced screening in patients with risk factors.
`E78.0`	Pure hypercholesterolemia	Relevant for assessing HDL efflux function in patients with elevated LDL cholesterol.
`I10`	Essential (primary) hypertension	Hypertension is a common comorbidity prompting comprehensive cardiovascular risk evaluation including `0541U`.
`E11.9`	Type 2 diabetes mellitus without complications	Diabetes increases cardiovascular risk and is an indication for advanced risk stratification tests like `0541U`.
`Z12.1`	Encounter for screening for malignant neoplasm of skin (not directly related)	Data not applicable — Data not available in the input.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`80061`	Lipid panel (total cholesterol, HDL cholesterol, LDL cholesterol, triglycerides)	Common baseline test performed before or alongside `0541U` for standard lipid profiling and clinical correlation with HDL function results.
`83695`	Apolipoprotein B, direct measurement	Performed in some cardiovascular risk assessments to complement HDL functional data from `0541U`.
`84478`	Troponin I or T, quantitative	Used in acute coronary syndrome evaluation; may be ordered concurrently in symptomatic patients undergoing risk assessment.
`93000`	Electrocardiogram, routine ECG with interpretation and report	Noninvasive cardiac testing often used in broader cardiovascular evaluation that may accompany ordering of `0541U`.
`93880`	Duplex scan of extracranial arteries; limited or follow-up study	Imaging studies for vascular assessment that can be part of an extended workup when `0541U` suggests elevated pCAD risk.