Sinus venosus atrial septal defect, unspecified

This code represents a congenital heart defect where there is an abnormal opening in the atrial septum near the entrance of the superior or inferior vena cava, specifically when the exact location (superior or inferior vena cava type) is not documented. This defect allows oxygenated blood from the left atrium to mix with deoxygenated blood in the right atrium, leading to a left-to-right shunt.

Use this code when documentation confirms a sinus venosus atrial septal defect but does not specify whether it is of the superior or inferior vena cava type. This typically occurs when a definitive diagnosis of sinus venosus ASD is made, but further anatomical detail is lacking in the medical record.

• Do not use this code if the specific type of sinus venosus defect (superior or inferior vena cava) is documented; instead, use the more specific codes.
• Ensure documentation clearly states "sinus venosus" to differentiate from other types of atrial septal defects.
• Consider querying the provider for further specificity if the documentation is unclear regarding the exact location of the defect.