Primary atelectasis of newborn ICD-10-CMP28.0 https://icd10coded.com/cm/P28.0/ Includes: Primary failure to expand terminal respiratory units, Pulmonary hypoplasia associated with short gestation, Pulmonary immaturity NOS Index of diseases: Nonexpansion, lung (newborn), Nonpneumatization, lung NEC, Apneumatosis, newborn