Other specified atrial septal defect

This code signifies a congenital heart anomaly characterized by an abnormal opening in the atrial septum that does not fit the descriptions of ostium secundum, ostium primum, or sinus venosus defects. These defects allow for shunting of blood between the atria, potentially leading to right heart volume overload and pulmonary hypertension over time.

Use this code when documentation specifies an atrial septal defect (ASD) that is not otherwise classified as ostium secundum, ostium primum, or sinus venosus. Examples include coronary sinus ASDs or unroofed coronary sinus. Documentation should clearly identify the specific type of ASD as "other specified" or provide details that preclude more specific ASD codes.

• Do not use this code if a more specific ASD type (e.g., Q21.0 for ostium secundum) is documented.
• Ensure the physician's documentation explicitly states "other specified" or provides enough detail to rule out other specific ASDs.
• Consider any associated cardiac anomalies and code them separately if present and documented.