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
Call the IRS toll-free number (800) 829-1040. Related Resources. 1  Treasury Offset Program Call Center. ( 2 800) 304-3107, or for International Calls click here. 3  Internal Revenue Service. ( 4 800) 829-1040. 5  IRS Form 8379.