Summary & Overview
CPT 80299: Therapeutic Drug Quantitation, Unlisted Procedure
CPT code 80299 is an unlisted laboratory code for therapeutic drug quantitation procedures that lack a specific CPT descriptor. Nationally, unlisted codes like 80299 matter because they capture nonstandard or emerging assays used to monitor drug levels for therapeutic management, impacting billing clarity, prior authorization, and reimbursement pathways. The code is relevant to clinical laboratories, hospital labs, and clinicians managing drug therapies that require precise quantitation when no specific CPT code exists.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how 80299 is used in clinical practice, typical sites of service, and common considerations for reporting an unlisted therapeutic drug quantitation test. The publication also outlines expected benchmarking topics and policy issues readers can expect: claim submission guidance for unlisted laboratory procedures, payer adjudication patterns, documentation needs to support medical necessity, and implications for lab operations and clinician communication.
This summary provides concise context for stakeholders seeking clarity on when to report 80299, what national payers typically consider when reviewing unlisted therapeutic drug quantitation claims, and the types of policy and clinical topics covered in the full publication. Data not available in the input.
Billing Code Overview
CPT code 80299 is an unlisted code used to report therapeutic drug quantitation procedures that do not have a specific CPT code. It is intended for laboratory measurement and quantitation of drug levels in biological specimens when no established code describes the exact test performed.
Service type: Laboratory — therapeutic drug quantitation
Typical site of service: Clinical laboratory or hospital laboratory setting
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Clinical & Coding Specifications
Clinical Context
A typical patient is an adult outpatient undergoing therapeutic drug monitoring for a medication without a designated CPT code. For example, a patient with complex epilepsy on an uncommon anticonvulsant or a transplant recipient on an experimental immunosuppressant requires serum quantitation to confirm therapeutic levels and avoid toxicity. The clinical workflow begins with an ordering provider (neurology, transplant medicine, or infectious disease) placing the laboratory test order. A phlebotomy draw is performed at an ambulatory clinic, hospital outpatient lab, or inpatient unit. The specimen is sent to the clinical laboratory where a qualified technologist performs an assay (often using mass spectrometry, immunoassay, or chromatographic methods). Results are validated by a laboratory director and reported to the ordering clinician. If results are unexpected, the clinician may request repeat testing, dose adjustment, or specialist consultation. Typical sites of service include hospital outpatient laboratories, independent reference laboratories, and hospital inpatient laboratories. The service type is therapeutic drug quantitation for analytes without an assigned specific CPT code, reported with 80299.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when only the physician interpretation or professional component of the test is reported separately from the technical component. |