Abnormal blood-gas level

This code signifies an abnormal finding in the levels of gases (such as oxygen, carbon dioxide, and pH) in arterial or venous blood. It indicates a physiological imbalance in the body's acid-base status or respiratory function, often detected through an arterial blood gas (ABG) test.

Apply this code when documentation indicates an abnormal blood gas result, such as hypoxemia, hypercapnia, acidosis, or alkalosis, without a more specific definitive diagnosis established. It is appropriate when the physician explicitly notes the abnormal blood gas findings as a significant clinical concern or reason for further investigation/management.

• Do not use this code if a definitive diagnosis explaining the abnormal blood gas (e.g., acute respiratory failure, diabetic ketoacidosis) is documented.
• Sequence this code as a secondary diagnosis when it represents a manifestation of an underlying condition, or as a primary diagnosis if the abnormal blood gas is the primary reason for the encounter and no definitive cause is yet identified.
• Ensure the medical record clearly states the specific abnormal blood gas finding (e.g., "hypoxemia noted," "elevated pCO2") to support the use of this code.