The incidence and prevalence of pulmonary disease due to Non-tuberculous mycobacteria (NTM) is increasing worldwide, and this trend has been confirmed in Korea. Treatment of NTM pulmonary disease is difficult and usually requires more than two years of long-term treatment, and the antibiotic regimens used in treatment vary. Therefore, it is difficult to track the natural history of patients with NTM pulmonary disease, to evaluate the treatment outcome, and to understand the effect of specific medicines on the outcome. Establishing a prospective registry of patients with NTM pulmonary disease is expected to accurately evaluate the progress, treatment modality, and treatment outcome of NTM pulmonary disease.

Inclusion Criteria:

1. Clinical diagnosis of NTM pulmonary disease.
2. The causative agent of NTM pulmonary disease includes: M. avium complex, or M. abscessus subspecies abscessus, or M. abscessus subspecies massiliense, or M. kansasii.
3. Patients who starts new treatment (those who have previous history of treatment are eligible)

Exclusion Criteria

1. Patients who have been treated for more than 4 weeks.
2. The causative agent of NTM pulmonary disease is none of M. avium complex, M. abscessus subspecies abscessus, M. abscessus subspecies massiliense, or M. kansasii.

Patients with NTM lung disease initiating treatment at each hospital participating in the study