Other congenital malformations of great veins

This code signifies various congenital structural abnormalities affecting the large veins of the body, excluding those specifically classified elsewhere. These malformations can involve the superior vena cava, inferior vena cava, pulmonary veins, or other major venous structures, leading to impaired blood flow or altered circulatory patterns.

Apply this code when documentation specifies a congenital malformation of a great vein that is not more precisely categorized by another ICD-10-CM code. This includes conditions like anomalous systemic venous connections, hypoplasia or atresia of a major vein, or persistent left superior vena cava draining to the coronary sinus, when a more specific code is unavailable. Documentation should clearly state the congenital nature and the specific great vein(s) involved.

• Always seek a more specific code if available for the documented congenital great vein malformation.
• Do not use this code for acquired venous conditions or for congenital anomalies of arteries.
• Ensure documentation specifies "congenital" to support the use of this Q-code.