A31.0Pulmonary mycobacterial infection

A31.0 is the ICD-10-CM diagnosis code for pulmonary mycobacterial infection. It belongs to category A31 (infection due to other mycobacteria), block A30-A49 (other bacterial diseases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A31 (infection due to other mycobacteria), A31.0 is specifically for pulmonary mycobacterial infection. Related codes cover cutaneous mycobacterial infection (A31.1), disseminated mycobacterium avium-intracellulare complex (DMAC) (A31.2), other mycobacterial infections (A31.8) and mycobacterial infection, unspecified (A31.9).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 177 (Respiratory Infections and Inflammations with MCC, relative weight 1.6092), DRG 178 (Respiratory Infections and Inflammations with CC, relative weight 0.9744) and DRG 179 (Respiratory Infections and Inflammations without CC/MCC, relative weight 0.7345), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 031.0 (pulmonary diseases due to other mycobacteria).