5C73.0 Acute respiratory acidosis

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2026-01


This is an acute condition in which decreased ventilation (hypoventilation) causes increased blood carbon dioxide concentration and decreased pH (a condition generally called acidosis). Carbon dioxide is produced continuously as the body's cells respire, and this CO2 will accumulate rapidly if the lungs do not adequately expel it through alveolar ventilation. Alveolar hypoventilation thus leads to an increased PaCO2 (called hypercapnia). The increase in PaCO2 in turn decreases the HCO3-/PaCO2 ratio and decreases pH.

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