For a natural killer (NK) cell total count in a patient with AIDS, what CPT code is reported?

The correct CPT code for reporting a natural killer (NK) cell total count in a patient with AIDS is 86357. This code specifically addresses the quantitative measurement of NK cell activity, which is important in evaluating immune function, especially in patients with immunocompromising conditions such as AIDS.

The reason this code is appropriate lies in the specificity of the code set for immunological tests. Codes in the range from 86356 to 86359 represent different aspects of immune measurement related to NK cells. In this context, 86357 is designated for the total count of NK cells, making it the most relevant choice for quantifying NK cell levels.

Utilizing the correct numerical code is essential because it ensures accurate billing and reflects the services provided. Each of the other codes in the series refers to different types of NK cell assessments or related immune responses, which are not applicable when specifically measuring the total count in a patient with AIDS.