Pulmonology ICD-10-CM codes

COPD coding turns on the encounter's acuity: J44.9 for stable disease, J44.1 with acute exacerbation, and J44.0 with an acute lower respiratory infection (code the infection, such as J18.9, additionally). Both J44.0 and J44.1 may be reported together when an infection triggers an exacerbation. Add the smoking status every time: F17.210 for current cigarette dependence or Z87.891 for personal history of nicotine dependence.

Asthma should be coded by documented severity rather than J45.909: J45.40 moderate persistent and J45.50 severe persistent uncomplicated, with J45.901 for unspecified asthma with exacerbation. Severity-specific coding is what biologic prior authorizations key on. Chronic respiratory failure uses J96.10, or J96.11 with hypoxia; patients on home oxygen also carry Z99.81 (dependence on supplemental oxygen), which supports oxygen recertification.

Nodule surveillance and cancer screening are distinct: R91.1 (solitary pulmonary nodule) is the follow-up diagnosis for serial CT of a known nodule, while Z12.2 covers lung cancer screening in an eligible asymptomatic smoker, paired with the F17.21 or Z87.891 smoking code. Interstitial disease coding separates unspecified pulmonary fibrosis (J84.10) from idiopathic pulmonary fibrosis (J84.112), which antifibrotic coverage requires. For sleep apnea, G47.33 (obstructive) needs a sleep study in the record; obesity hypoventilation syndrome is E66.2.