Summary & Overview
CPT 80342: Antipsychotic Drug Testing for One to Three Drugs
CPT code 80342 identifies a laboratory assay that detects or quantifies one to three antipsychotic drugs in a patient specimen when the specific antipsychotics are not captured by other CPT codes. This code is nationally relevant because antipsychotic monitoring supports therapeutic management, adherence assessment, and safety surveillance for patients receiving psychiatric medications. Coverage, utilization, and coding practices for drug-specific toxicology influence clinical workflows, laboratory billing, and payer policy across public and private plans.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical purpose and typical sites of service for the test, a summary of common modifiers and billing considerations, and context on where this code fits within laboratory toxicology coding. The publication provides benchmarks and policy-relevant notes where available, clarifies the clinical scenarios that prompt ordering such assays, and outlines how CPT code 80342 differs from other drug-specific panels. Data not available in the input will be noted explicitly in dedicated sections.
Billing Code Overview
CPT code 80342 describes a laboratory test that measures the amount of, or detects the presence of, one to three antipsychotic medications in a patient specimen. Antipsychotics are drugs used to treat psychosis and other mental and emotional conditions. The test is intended to identify unspecified antipsychotic agents when the specific drugs of interest are not covered by other CPT codes.
Service type: Clinical laboratory drug testing / toxicology
Typical site of service: Clinical laboratory, hospital laboratory, outpatient laboratory collection sites, and other settings where diagnostic specimens are processed and analyzed.
Clinical & Coding Specifications
Clinical Context
A 34-year-old adult male with a history of schizophrenia presents to an outpatient behavioral health clinic for routine monitoring after a medication change. The treating psychiatrist orders a urine or serum drug test to measure one to three antipsychotic agents to confirm adherence, assess for polypharmacy, and evaluate therapeutic exposure. The specimen is collected in the clinic or sent to a reference laboratory. The laboratory analyst performs targeted qualitative and/or quantitative analysis for antipsychotic medications not otherwise specified by other CPT codes, documents results in the laboratory information system, and returns results to the ordering provider. Typical sites of service include outpatient behavioral health clinics, hospital outpatient laboratories, emergency departments when antipsychotic exposure is clinically relevant, and independent clinical laboratories. The clinical workflow includes specimen collection, chain-of-custody if required, specimen accessioning, analytic testing (e.g., immunoassay screening followed by confirmatory mass spectrometry when indicated), result verification by a qualified laboratory professional, and reporting to the ordering psychiatrist or treating team for medication management decisions.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the professional (interpretive) component of the laboratory test performed by a qualified pathologist or laboratory physician. |