Summary & Overview

CPT 0457U: PFAS 9 Panel, Blood Plasma/Serum by LC–MS/MS

CPT code 0457U designates a Proprietary Laboratory Analyses (PLA) test — the PFAS 9 Panel offered by Quest Diagnostics® — that measures nine perfluoroalkyl substances (PFAS) in blood plasma or serum using LC–MS/MS. This code matters nationally as PFAS exposure has public health implications and growing clinical interest, and proprietary PLA codes determine lab-specific billing and reporting pathways.

Key payers in the coverage landscape include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical purpose of the test, typical sites of service, and payer coverage themes. The publication summarizes national benchmarking context for proprietary laboratory testing, common modifier usage, and operational considerations for claims processing and billing workflows. It also highlights clinical context about PFAS testing methods and the unique nature of PLA coding that ties the code to a single manufacturer or laboratory.

The report does not present state-level policy detail; instead it provides national-level guidance on what CPT code 0457U represents, who the major payers are, and what billing and clinical topics to consider when managing claims for this PFAS panel.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare0457UCPTProprietary Laboratory AnalysesPFASLC-MS/MSLaboratory TestingClinical ToxicologyDiagnostic PanelQuest Diagnostics

Billing Code Overview

CPT code 0457U is a Proprietary Laboratory Analyses (PLA) code for the PFAS 9 Panel developed and reported by Quest Diagnostics®. This laboratory test quantifies nine perfluoroalkyl substances (PFAS) in a blood plasma or serum specimen using liquid chromatography with tandem mass spectrometry (LC–MS/MS). PFAS are man‑made chemicals found in various consumer and industrial products, and measurement can inform clinical and public health evaluation of exposure.

Service Type: Laboratory — Proprietary PFAS panel using LC–MS/MS

Typical Site of Service: Clinical laboratory or hospital outpatient laboratory

Data not available in the input for associated taxonomies, ICD‑10 diagnoses, related codes, and service line.

Clinical & Coding Specifications

Clinical Context

A patient with potential environmental exposure to per- and polyfluoroalkyl substances (PFAS) is evaluated in an outpatient occupational or environmental medicine clinic. The patient reports living near a firefighting training site and using nonstick cookware for many years, and presents with nonspecific symptoms such as fatigue, elevated cholesterol on prior labs, or concern about long-term cancer or reproductive risk. The ordering clinician documents exposure history and requests testing to quantify serum PFAS concentrations. A blood draw is collected (plasma or serum) during the clinic visit or at a phlebotomy site. The specimen is sent to Quest Diagnostics® for the proprietary PFAS 9 Panel analyzed by liquid chromatography–tandem mass spectrometry (LC–MS/MS). The laboratory performs analytic processing, interprets results vs. reference ranges, and issues a report to the ordering provider. Typical sites of service include outpatient clinics, occupational health centers, and commercial phlebotomy laboratories. Billing uses PLA code 0457U for the specific Quest Diagnostics® PFAS 9 Panel; professional interpretation by a clinician may be appended with appropriate evaluation and management or consultation codes when clinically indicated.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier applicable	Rarely used; default when no modifier applies to the laboratory PLA service

Taxonomy Code	Specialty	Notes
207Q00000X	Occupational Medicine	Common specialty ordering PFAS exposure testing in workplace or community exposure contexts
207RC0000X	Environmental/Public Health	Specialists evaluating environmental toxicant exposure and community-level testing initiatives
208100000X	Hematology & Oncology	May order PFAS testing in patients with hematologic abnormalities or oncology surveillance where exposure is a concern
207L00000X	Preventive Medicine	Clinicians focused on exposure risk assessment and population health screening
207Y00000X	Primary Care/Internal Medicine	Primary care clinicians frequently initiate testing based on history or screening abnormalities

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z77.22`	Contact with and (suspected) exposure to contaminants in environment	Captures documented environmental exposure history prompting PFAS testing
`Z77.9`	Contact with and (suspected) exposure to unspecified environmental hazards	General exposure screening rationale for ordering PFAS panel
`E78.5`	Hyperlipidemia, unspecified	Elevated cholesterol is a common clinical finding prompting concern about PFAS-related metabolic effects
`R53.83`	Other fatigue	Nonspecific symptom prompting environmental exposure evaluation including PFAS testing
`Z13.820`	Encounter for screening for environmental contaminants	Preventive or screening encounter where PFAS panel may be ordered

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36415`	Collection of venous blood by venipuncture	Specimen collection for serum or plasma required prior to performing the PFAS 9 Panel
`99000`	Handling and/or conveyance of specimen for transfer from physician office to a laboratory	Use when the office sends the blood specimen to an external laboratory for analysis
`83020`	Hemoglobin; glycosylated (A1C) (Note: example lab test)	Represents other common laboratory tests ordered concurrently during exposure workup; not directly related but often performed in parallel
`81002`	Urinalysis, non-automated, without microscopy	Ancillary lab commonly ordered in environmental exposure evaluations; may accompany PFAS testing
`99499`	Unlisted evaluation and management service	Use for nonstandard patient counseling or interpretation services that do not map to an existing E/M code when extensive result discussion occurs