Condition Description. Truncus arteriosus is an uncommon congenital heart defect where a baby is born with a single blood vessel (called a truncus) coming from the main pumping chambers of the heart (the ventricles) instead of two vessels (one from each ventricle).ondition Description. Truncus arteriosus is an uncommon congenital heart defect where a baby is born with a single blood vessel (called a truncus) coming from the main pumping chambers of the heart (the ventricles) instead of two vessels (one from each ventricle).
IRS Office Customer Service Phone Number Phone Number: 1 (800) 829-1040. Shortcut: N/A - Edit
IRS international customer service phone numbers and address: 1  International Taxpayer Service Call Center Phone Number: 267-941-1000. 2  Austin Customer Service Number: 512-416-7750 (not toll-free). 3  Puerto Rico IRS toll free Number: 1-800-829-1040. 4  Virgin Islands Customer Care Number: 1-800-829-1040.