CPT® Code 86611

The CPT® Code 86611 refers to the laboratory test for antibodies to Bartonella, a genus of bacteria known to cause various clinical manifestations in humans. This test is crucial for diagnosing infections caused by Bartonella species, particularly in patients presenting with symptoms such as fever, chills, headaches, and progressive anemia during the acute phase of the infection. In chronic cases, patients may experience musculoskeletal pain and skin lesions, which can also affect mucous membranes. The most prevalent species in the United States is Bartonella henselae, which is notably associated with cat-scratch disease, a localized infection characterized by fever, headache, loss of appetite, and swollen lymph nodes. In immunocompromised individuals, such as those with HIV, B. henselae can lead to skin lesions that may resemble Kaposi's sarcoma. The infection can also have severe neurological implications, including meningoencephalitis, which may result in seizures, paralysis, and potentially fatal outcomes. Various testing methodologies are employed to detect Bartonella infections, including indirect hemagglutination (IHA), indirect fluorescent antibody (IFA), and enzyme-linked immunosorbent assay (ELISA). The test distinguishes between immunoglobulin classes, with IgG testing indicating past or current infections and IgM testing specifically identifying current infections. It is important to report the results of IgG and IgM tests separately when both are conducted, ensuring accurate diagnosis and management of the infection.