Primary respiratory tuberculosis

This code represents an initial infection with Mycobacterium tuberculosis that primarily affects the respiratory system, leading to the development of primary tuberculosis. It signifies the first stage of the disease, often characterized by a localized inflammatory response in the lungs and regional lymph nodes.

Use this code for patients diagnosed with primary tuberculosis where the infection is localized to the respiratory system, such as primary pulmonary tuberculosis. Documentation supporting its use typically includes positive tuberculin skin tests, interferon-gamma release assays (IGRAs), chest X-rays showing primary complex, and/or positive sputum cultures for M. tuberculosis in the absence of evidence of reactivation or extrapulmonary involvement.

• Differentiate from secondary (reactivation) tuberculosis, which involves different ICD-10-CM codes.
• Ensure documentation clearly specifies "primary" respiratory involvement to avoid confusion with other forms of tuberculosis.
• Always code the infectious agent (B90.x) as an additional diagnosis if known and relevant.