Summary & Overview
CPT 0566U: Episeek MPE Malignant Pleural Effusion Detection Test
CPT code 0566U designates the Episeek™ MPE (Malignant Pleural Effusion Detection Test), a proprietary laboratory test that uses qPCR to evaluate methylation changes across 13 DNA regions in pleural fluid and reports a qualitative result by algorithm. As a PLA code, 0566U is specific to Precision Epigenomics Inc.’s single test and is used when billing for that proprietary assay. Nationally, PLA codes like 0566U matter because they standardize reporting for unique commercial diagnostics and inform coverage and payment discussions for molecular tests that support cancer-related diagnosis or management.
Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for pleural fluid molecular testing, payer coverage considerations, and benchmarks relevant to proprietary molecular diagnostics. The publication summarizes how CPT PLA coding functions, the intended use of the Episeek™ MPE test, and the typical laboratory setting for specimen processing. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 0566U is a Proprietary Laboratory Analyses (PLA) code that applies exclusively to the Episeek™ MPE (Malignant Pleural Effusion Detection Test) developed by Precision Epigenomics Inc. The test analyzes pleural fluid using quantitative polymerase chain reaction (qPCR) to assess methylation changes in 13 DNA regions and delivers a qualitative result through a proprietary algorithm.
Service Type: Laboratory testing using targeted qPCR-based methylation analysis.
Typical Site of Service: Clinical laboratory or specialized molecular diagnostics laboratory processing pleural fluid specimens.
Clinical & Coding Specifications
Clinical Context
A typical patient scenario involves an adult presenting with a pleural effusion of unclear etiology identified on chest radiograph or chest CT. The treating clinician (pulmonologist, thoracic surgeon, or interventional radiologist) performs thoracentesis to obtain pleural fluid for diagnostic testing. When cytology and standard laboratory testing (cell count, chemistry, Gram stain/culture) are inconclusive for malignancy, the clinician sends pleural fluid for the Episeek™ MPE (Malignant Pleural Effusion Detection Test) to evaluate DNA methylation patterns in 13 genomic regions by quantitative PCR. The laboratory performs the proprietary assay and runs an algorithm to provide a qualitative result (e.g., positive/negative for methylation patterns associated with malignant pleural effusion). Typical sites of service include hospital-based laboratories, hospital outpatient departments, and independent clinical reference laboratories that process specimens received from inpatient or outpatient settings. The clinical workflow: patient evaluation → thoracentesis and specimen collection → standard pleural fluid studies and cytology → send additional aliquot to the lab performing the Episeek™ MPE (0566U) → laboratory analytic processing and algorithmic interpretation → result returned to ordering clinician for integration into diagnostic decision-making regarding malignant pleural effusion.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Original submission (no modifier) | Use when reporting the test without any modifier appended to indicate standard reporting per payer rules. |
22 | Increased procedural service | Use when documentation supports substantially greater laboratory complexity, time, or resources than typical for this test and the payer allows modifier 22 on PLA codes. |
52 | Reduced services | Use when the test was partially reduced or not fully performed (for example, inadequate specimen volume preventing full panel) and the lab documents the reduction. |
53 | Discontinued procedure | Use when specimen processing was begun but the test could not be completed and the lab documents the reason for discontinuation. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207RP0010X | Pulmonology | Pulmonologists frequently order pleural fluid diagnostics and manage pleural effusions. |
2084P0800X | Thoracic Surgery | Thoracic surgeons perform diagnostic and therapeutic pleural procedures and order advanced testing. |
363L00000X | Clinical Laboratory | Clinical laboratory directors and pathologists oversee specialized molecular tests such as PLA assays. |
207K00000X | Critical Care Medicine | Intensivists may order pleural diagnostics in hospitalized critically ill patients. |
208000000X | Internal Medicine | Hospitalists or internists frequently initiate pleural fluid evaluation and order send-out molecular testing. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
J90 | Pleural effusion, not elsewhere classified | Primary indication for pleural fluid sampling and use of molecular assays to evaluate for malignancy. |
C34.90 | Malignant neoplasm of unspecified part of unspecified bronchus or lung | Lung cancer is a common cause of malignant pleural effusion; Episeek™ MPE results help detect malignant involvement. |
C78.2 | Secondary malignant neoplasm of pleura | Directly relevant when metastasis to the pleura is suspected; test aids in identifying malignant pleural effusion. |
R09.1 | Pleurisy | Pleural inflammation/pleurisy can cause effusion; differentiation from malignant causes may prompt molecular testing. |
R04.2 | Pleurocentesis (ICD-10-CM often coded as procedure Z44.* not applicable) | Note: Procedure coding varies; clinical relevance is that pleural fluid removal for diagnostic analysis precedes the Episeek™ test. |
C80.1 | Malignant (primary) neoplasm, unspecified | When malignancy is suspected but primary site is unconfirmed; pleural fluid molecular testing contributes diagnostic data. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
32421 | Diagnostic thoracentesis, with imaging guidance when performed (needle or catheter), initial or subsequent | Performed to obtain pleural fluid specimen for cytology and molecular testing such as the Episeek™ MPE. |
88112 | Cytopathology, fluid, washings, or brushings, for diagnosis (interpretation) | Standard cytologic evaluation of pleural fluid typically performed alongside molecular testing to detect malignant cells. |
83890 | Molecular pathology procedure, each targeted genomic sequence analysis, direct probe technique (e.g., qPCR) | Represents molecular analytic methods similar in technique (qPCR) though 0566U is a PLA code specific to the Episeek™ assay; labs may bill 0566U instead of generic molecular codes. |
36415 | Collection of venous blood by venipuncture | Common specimen collection CPT for required blood tests that may accompany pleural fluid diagnostic workup (pre-procedure labs, biomarkers). |