Summary & Overview

CPT 86316: Quantitative Immunoassay for Tumor Antigen Measurement

Headline: CPT code 86316: Quantitative Tumor Antigen Immunoassay Gains Attention for Laboratory Oncology Monitoring

Lead: CPT code 86316 represents a quantitative immunoassay used to measure tumor-associated antigens such as CA 50, CA 72.4, or CA 549 in patient specimens. The test is performed in clinical or hospital laboratories and is used in oncologic monitoring and tumor marker assessment.

What this code represents and why it matters: CPT code 86316 designates a lab-performed quantitative immunoassay for specific tumor antigens. Tumor marker assays are used in cancer diagnosis, prognosis, and monitoring of treatment response. As molecular and immunologic testing expands, standardized coding for these assays supports consistent billing, clinical tracking, and comparative utilization nationally.

Key payers covered: Analysis considers common national payers, including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

What readers will learn: The publication provides benchmarks and clinical context for CPT code 86316, including typical sites of service (clinical and hospital laboratories), service line classification (laboratory oncology testing), and common modifiers used with laboratory services. It outlines how the code fits into laboratory workflows for tumor marker measurement and summarizes available administrative details. Data not available in the input for payer-specific coverage rules, reimbursement rates, and associated ICD-10 diagnoses.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare86316CPTtumor-markerimmunoassaylaboratoryoncologyclinical-labquantitative-assay

Billing Code Overview

CPT code 86316 describes a quantitative immunoassay for tumor-associated antigens. The laboratory analyst performs a measurement of a specimen to evaluate levels of tumor antigens such as CA 50, CA 72.4, or CA 549.

Service Type: Laboratory — Quantitative Immunoassay (Tumor Marker Testing)

Typical Site of Service: Clinical laboratory or hospital laboratory

Data not available in the input for payers, associated taxonomies, ICD-10 diagnoses, and related codes.

Clinical & Coding Specifications

Clinical Context

A 62-year-old female with a history of epigastric discomfort and unintentional weight loss is referred by her gastroenterologist for tumor marker testing. The clinician orders a quantitative immunoassay for a gastric tumor antigen (e.g., CA 72-4) to assist in diagnosis and baseline staging prior to imaging and endoscopic biopsy. A phlebotomy technician collects a peripheral blood specimen, which is labeled and transported to the central clinical laboratory. A medical laboratory technologist performs the quantitative immunoassay per the laboratory’s validated protocol, generating a numeric result reported in the electronic medical record. Results are reviewed by the lab director and released as the final report. The result is used by the ordering provider to support differential diagnosis, guide further diagnostic procedures (endoscopy, biopsy, cross-sectional imaging), and establish a baseline for monitoring response to therapy or disease recurrence during follow-up care.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when only the professional interpretation or analysis portion of the test is billed separately from the technical component.
`TC`	Technical component	Use when billing only the technical component (laboratory instrumentation, reagents, and technician time).
`90`	Reference (outside) laboratory	Use when the specimen is sent to an outside independent laboratory for testing.
`91`	Repeat clinical diagnostic laboratory test	Use when a repeat test is performed on the same day to confirm results.
`59`	Distinct procedural service	Use when this assay is a separately identifiable service from other lab procedures on the same date.
`52`	Reduced services	Use when the service is partially reduced or not completed as described by the full procedure.
`22`	Increased procedural services	Use when additional work or complexity justifies increased payment and documentation supports it.
`53`	Discontinued procedure	Use when testing is started but discontinued prior to completion for documented clinical reasons.
`90`	Reference (outside) laboratory	Use when the test was performed by an outside laboratory (listed for emphasis in networks that require reference testing).
`91`	Repeat clinical diagnostic laboratory test	Use for repeat analyses to verify unexpected or critical values (listed for emphasis).
`59`	Distinct procedural service	Use to indicate a distinct assay separate from other services provided the same day.

Taxonomy Code	Specialty	Notes
124Q00000X	Clinical Laboratory Technologist/Technician	Primary personnel who perform the immunoassay testing.
207RR0500X	Pathology	Pathologists may interpret complex or confirmatory tumor marker results.
207K00000X	Hematology & Oncology	Oncologists commonly order tumor antigen assays for diagnosis and monitoring.
207L00000X	Gastroenterology	Gastroenterologists order gastric tumor antigen testing in suspected gastrointestinal malignancy.
261QM0800X	Diagnostic Radiology	Radiologists use results as adjunct information when staging and planning imaging correlation.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C16.9`	Malignant neoplasm of stomach, unspecified	Gastric tumor antigens such as CA 72-4 are used in evaluation and monitoring of stomach cancer.
`C18.9`	Malignant neoplasm of colon, unspecified	Tumor antigen testing can be adjunctive for colorectal malignancy assessment and surveillance.
`C20`	Malignant neoplasm of rectum	Used in the diagnostic workup and monitoring of rectal cancer in conjunction with imaging and pathology.
`R19.4`	Change in bowel habit	Symptom prompting tumor marker testing as part of evaluation for possible gastrointestinal malignancy.
`R63.5`	Abnormal weight gain	Unintentional weight loss is commonly coded as `R63.4`; if present, weight change prompts cancer evaluation including tumor markers.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`86316`	Immunoassay for tumor antigen, quantitative (e.g., CA 50, CA 72-4, CA 549)	Primary assay code describing the quantitative immunoassay performed on the patient specimen.
`36415`	Collection of venous blood by venipuncture	Performed prior to the assay to obtain the specimen for the quantitative immunoassay.
`84153`	Tumor marker assay (PSA)	Example of a different tumor marker assay commonly ordered alongside markers to evaluate malignancy or differential diagnosis.
`83912`	Drug assay, quantitative; immunoassay	Related laboratory methodology code representing quantitative immunoassay techniques used in clinical labs (methodology overlap).
`88305`	Surgical pathology, gross and microscopic examination	Performed when tissue biopsy follows abnormal tumor marker results and is used for histopathologic diagnosis.
`77386`	Radiation therapy management, complex (example follow-up)	May be used later in the care pathway if tumor marker results contribute to cancer treatment planning (care coordination).