CPT® Code 86713

The CPT® Code 86713 refers to a laboratory test specifically designed to measure antibodies against Legionella, a type of bacteria that can cause pneumonia and flu-like illnesses in humans. Legionella is commonly found in various environmental sources, particularly in water systems such as hot tubs, hot water tanks, swamp coolers, large plumbing systems, and decorative fountains. The presence of this bacteria can lead to serious health issues when individuals inhale mist or vapor that contains it. The test identifies six different serotypes of Legionella antibodies, with Type 1 being the most prevalent and frequently tested in clinical settings. For a comprehensive assessment, both IgM and IgG antibodies are measured, as they develop simultaneously during an infection. The IgM antibodies typically remain elevated as long as the IgG response is active, making it essential to test for both to ensure accurate clinical interpretation of the patient's immune response. The procedure involves obtaining a blood sample through venipuncture, which is reported separately, and the serum is then analyzed using a semi-quantitative indirect fluorescent antibody method to determine the presence and levels of these antibodies.