Summary & Overview
CPT 82331: Total Calcium Test During Provocative Infusion
CPT code 82331 represents a total calcium laboratory test performed on serum specimens collected at timed intervals during a provocative infusion test. This code identifies a specific diagnostic measurement used to monitor biochemical response to an infused agent and can be integral to endocrine, nephrology, or metabolic diagnostic protocols. Nationally, standardized reporting of such laboratory procedures supports clinical decision-making and billing consistency across inpatient and outpatient laboratory settings.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The overview addresses how payers typically cover laboratory services of this nature and highlights items readers will find useful for practice operations and revenue cycle teams.
Readers will learn the clinical context for using CPT code 82331, typical sites of service where the test is performed, common billing considerations, and which payers are relevant for national-level coverage discussions. Benchmarks, policy updates, and payer-specific guidance are summarized where available. Data not available in the input is noted as such in relevant sections.
Billing Code Overview
CPT code 82331 describes a total calcium laboratory test performed on a specimen, typically serum, collected at specified intervals following the infusion of medication during a provocative test. The service involves laboratory analysis by a clinical laboratory analyst to measure total serum calcium levels as part of a diagnostic protocol that assesses patient response to an administered agent.
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Service type: Clinical laboratory test (total serum calcium measurement during a provocative infusion protocol)
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Typical site of service: Hospital outpatient laboratory, hospital inpatient laboratory, or independent clinical laboratory where timed specimens are collected per the test protocol
Clinical & Coding Specifications
Clinical Context
A typical patient is a 45-year-old adult undergoing a diagnostic provocative test to evaluate suspected disorders of calcium metabolism or parathyroid function (for example, evaluation of hypercalcemia or suspected hypoparathyroidism). The patient presents to an outpatient infusion or clinical laboratory service where a medication or provocative agent (such as a calcium infusion or other diagnostic agent) is administered per a standardized protocol. Serum specimens are collected by the phlebotomist or nurse at protocol-specified intervals (baseline and timed post-infusion draws) and labeled for total calcium measurement. The laboratory analyst performs 82331 (total calcium) testing on the collected serum specimens. Typical site of service is an outpatient infusion center, hospital outpatient lab, or ambulatory clinic with phlebotomy and laboratory services. The workflow includes: patient consent and verification, IV placement and infusion per protocol, timed blood draws noted in the medical record, specimen transport to the clinical lab, processing and analysis of total calcium, and result reporting to the ordering clinician for interpretation and subsequent care planning.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the professional interpretation/reporting portion if applicable for a test requiring interpretation |