CPT 84260: Serotonin Measurement in Blood

CPT code 84260 represents a laboratory test that measures serotonin levels, typically performed on a patient blood specimen. Serotonin testing can inform diagnosis and management of disorders affecting serotonin metabolism or related clinical conditions, making this code relevant across outpatient and inpatient laboratory settings nationwide. The code is used by clinical laboratories and hospital labs to report quantitative serotonin assays.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for serotonin measurement, typical sites of service, and the payer landscape covered in this analysis. The publication summarizes coding and billing considerations for laboratories, highlights common modifiers in use, and explains where data are unavailable.

The report provides national benchmarks and policy-relevant notes to inform billing teams and practice managers about reimbursement context and documentation expectations. It also outlines common clinical scenarios in which serotonin measurement is ordered, and directs readers to where to find additional coding and coverage details. Data not available in the input include associated taxonomies, ICD-10 diagnoses, and related codes.

Billing Code Overview

CPT code 84260 describes a laboratory assay in which a clinical laboratory analyst measures serotonin concentration, typically from a patient blood specimen. The testing procedure is a clinical laboratory service used to evaluate serotonin levels for diagnostic and monitoring purposes in conditions where serotonin measurement is clinically relevant.

Service type: Laboratory test (quantitative measurement of serotonin)

Typical site of service: Clinical laboratory or hospital laboratory (blood specimen collection and analysis)

Clinical Context

A typical scenario involves an outpatient or inpatient adult who presents for evaluation of symptoms suggesting a neuroendocrine tumor, carcinoid syndrome, or serotonin-related psychiatric/metabolic conditions. A clinician (endocrinologist, gastroenterologist, oncologist, or psychiatrist) orders a laboratory measurement of blood serotonin to aid diagnosis, monitor therapy, or evaluate systemic serotonin levels when urinary 5-HIAA or whole-blood serotonin is indicated. The clinical workflow: a clinician documents indication and orders 84260; a phlebotomy technician draws a blood specimen into the appropriate tube, labels and sends it to the clinical laboratory; the laboratory analyst performs the serotonin assay, documents test method and results in the laboratory information system, and the result is communicated to the ordering clinician for interpretation and follow-up. Typical sites of service include outpatient laboratory draw stations, hospital inpatient units, specialty clinic labs, and reference laboratory facilities.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when only the physician interpretation or professional component of a test is billed separate from the technical component.

Taxonomy Code	Specialty	Notes
`207RG0100X`	Clinical Laboratory Specialist	Laboratory directors and clinical pathologists overseeing testing methods and quality control.
`208000000X`	Pathology & Laboratory Medicine	Pathologists who interpret specialized laboratory tests.
`207L00000X`	Clinical Laboratory Technologist/Technician	Personnel who perform the assay and technical procedures.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`E34.0`	Carcinoid syndrome	Serotonin-producing neuroendocrine tumors commonly cause elevated blood serotonin.
`C7A.099`	Malignant neuroendocrine tumor of unspecified site	Neuroendocrine tumors are evaluated with serotonin and related markers.
`F32.9`	Major depressive disorder, single episode, unspecified	Serotonin measurement may be considered in research or complex pharmacologic monitoring, though not routine for primary psychiatric diagnosis.
`R53.82`	Chronic fatigue, unspecified	Nonspecific symptoms prompting broader metabolic and neuroendocrine evaluation including serotonin in selected cases.
`I95.9`	Hypotension, unspecified	Flushing and hypotension in carcinoid syndrome correlate with serotonin and other vasoactive mediator testing.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`80053`	Comprehensive metabolic panel	Common baseline chemistry panel ordered alongside serotonin testing to assess organ function during workup.
`81002`	Urinalysis, non-automated, without microscopy	Urine studies such as urinary 5-HIAA may be ordered in parallel for carcinoid workup.
`83912`	Assay of 5-hydroxyindoleacetic acid (5-HIAA), urine	Directly related confirmatory test for serotonin-secreting tumors; often performed alongside blood serotonin.
`88305`	Level IV surgical pathology, gross and microscopic examination	Tissue biopsy pathology that may follow abnormal serotonin/5-HIAA results when a tumor is suspected.
`80307`	Drug screen, qualitative, multiple drug classes	May be used to exclude medication effects on serotonin levels when medication interference is a concern.

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Summary & Overview