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
â¢ Business taxpayers Taxpayers with small business-related questions should call 1-800-829-4933. â¢ Understanding a notice If you received a notice, call the number on your notice, not the main help line, to reach the IRS staff trained to help with that issue. â¢ Specialized reasons If you're calling for a very specific reason, there may be a direct phone number you should call instead of the main IRS help line.