Pressr collapse of lung due to anesth during preg, unsp tri

This code describes a collapsed lung (pneumothorax or atelectasis) caused by the effects of anesthesia administered during pregnancy. The collapse is specifically due to pressure changes or direct effects of anesthetic agents on the pulmonary system. This diagnosis applies when the specific trimester of pregnancy is not documented.

Use this code when documentation clearly links a pressure-induced lung collapse (e.g., barotrauma from mechanical ventilation, anesthetic gas effects) to anesthesia administered during pregnancy. This code is appropriate when the medical record does not specify whether the event occurred in the first, second, or third trimester.

• Always sequence this code after the primary obstetric code (e.g., O9A.2- for complications of anesthesia during pregnancy).
• Ensure documentation explicitly states "pressure collapse" or a similar mechanism and links it to anesthesia.
• If the trimester is specified, use the more specific codes O29.021, O29.022, or O29.023.