Encounter for testing for latent tuberculosis infection

This code signifies an encounter where a patient is being evaluated for the presence of dormant Mycobacterium tuberculosis in their system, without exhibiting active disease symptoms. The purpose of the visit is to determine if the individual has been infected with the bacteria, even if they are currently asymptomatic.

This code is appropriate for screening encounters in high-risk populations, such as healthcare workers, recent immigrants from high-prevalence areas, or individuals with compromised immune systems. It is also used when a patient has had close contact with someone with active tuberculosis and requires testing.

• Do not use this code if the patient has active tuberculosis; instead, use codes from the A15-A19 range.
• This code is typically a primary diagnosis for screening encounters.
• Consider adding a secondary code for any underlying risk factors (e.g., immunosuppression, exposure history) if known and documented.