CPT 80332 Serotonergic Antidepressant Reimbursement

CPT code 80332 represents a laboratory assay that detects or measures one or two serotonergic antidepressants in a patient specimen. This code covers targeted toxicology/therapeutic drug monitoring for psychiatric medications that influence serotonin, and it matters nationally because such testing supports medication management, safety monitoring, and forensic or compliance evaluations across outpatient and inpatient settings. Payers commonly involved in coverage considerations include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will find an overview of clinical context and use cases for 80332, how the service is typically delivered in clinical laboratories, and the implications for billing and claims submission. The publication includes benchmarking and coverage considerations for major national payers listed above, summaries of common modifiers and claim components, and guidance on coding specificity for single versus dual-analyte assays. It also outlines the typical sites of service and the role of these assays in psychiatric medication management and safety monitoring. Data not available in the input is noted where applicable.

Billing Code Overview

CPT code 80332 describes a laboratory test in which a lab analyst measures the amount of or detects the presence of one or two serotonergic antidepressants in a patient specimen. This service is a therapeutic drug monitoring / toxicology assay focused on commonly used psychiatric medications that act on serotonin pathways.

Service type: Laboratory testing for drug detection/quantification
Typical site of service: Clinical laboratory or hospital laboratory; specimens collected in outpatient clinics, inpatient settings, or other collection sites as appropriate

Data not available in the input.

Clinical Context

A 34-year-old adult patient receiving care in an outpatient psychiatric clinic presents for therapeutic drug monitoring after initiating or adjusting therapy with a selective serotonin reuptake inhibitor (SSRI) or serotonin–norepinephrine reuptake inhibitor (SNRI). The prescriber requests quantitative/qualitative laboratory testing to detect the presence or measure the concentration of one or two serotonergic antidepressants in serum or plasma to assess adherence, potential toxicity, drug interactions, or unexpected lack of therapeutic effect. The specimen is collected in the clinic or an outpatient phlebotomy draw station, labeled, and sent to a clinical laboratory. The laboratory performs the assay using immunoassay or mass spectrometry methods, documents results in the electronic medical record, and reports levels to the ordering clinician who integrates findings with clinical assessment and medication history.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional interpretation component of a split pathology/lab service, if applicable under local policies.
`90`	Reference (outside) laboratory	Use when testing is performed by an outside independent reference lab and the billing provider is the ordering/principal lab.

Taxonomy Code	Specialty	Notes
207Q00000X	Psychiatry & Neurology	Psychiatrists ordering and interpreting therapeutic drug monitoring for antidepressant management.
207L00000X	Clinical Pathology	Pathologists overseeing laboratory testing and interpretation.
207K00000X	Clinical Laboratory	Laboratory medicine specialists performing assays and quality control.
2084P0800X	Nurse Practitioner — Psychiatry	NPs in behavioral health ordering toxicology/therapeutic drug monitoring.
363LA2200X	Phlebotomy	Phlebotomists performing specimen collection and handling.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`F32.1`	Major depressive disorder, single episode, moderate	Common indication for initiating or monitoring SSRI/SNRI therapy; levels may be checked for adherence or toxicity.
`F33.1`	Major depressive disorder, recurrent, moderate	Used when monitoring antidepressant therapy in recurrent depression to assess adherence or unexpected response.
`F41.1`	Generalized anxiety disorder	SSRI/SNRI therapy is frequently used; testing may evaluate adherence or drug presence when clinical response is unclear.
`F43.21`	Adjustment disorder with depressed mood	Antidepressant use may be monitored for adherence or adverse effects.
`T43.205A`	Adverse effect of unspecified antidepressant, initial encounter	Relevant when assessing suspected toxicity or adverse reaction related to serotonergic agents.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`80332`	Antidepressant, one or two serotoninergic medications, qualitative or quantitative	This is the primary code describing the laboratory detection or measurement of one or two serotonergic antidepressants in a patient specimen.
`80307`	Drug screen, presumptive, any number of drug classes by instrumented chemistry analyzers; place of service variable	Often used as an initial presumptive urine drug screen prior to or alongside specific antidepressant assays for broader toxicology assessment.
`80336`	Antidepressant, three or more serotonergic medications, qualitative or quantitative	Used when testing includes three or more serotonergic agents instead of one or two; clinically related when expanded panels are ordered.
`80321`	Ethanol and/or blood alcohol concentration	May be ordered concurrently to assess alcohol co-ingestion or interactions affecting antidepressant metabolism.
`82542`	Assay of drug or metabolite, clonazepam, quantitative	Example of a single-drug quantitative assay code; illustrates parallel coding for other specific drug assays when available.

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Summary & Overview

CPT 80332: Detection of One or Two Serotonergic Antidepressants