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).
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IRS. Website: Internal Revenue Service (IRS) Contact: Contact the Internal Revenue Service. Help With Tax Questions. Taxpayer Advocate Service. Report Tax Fraud. IRS Hotlines. International IRS Offices. Where to File Paper Tax Returns. Local Offices: Find a Taxpayer Assistance Center Near You. Main Address: 1111 Constitution Ave., NW Washington, DC 20224. Phone Number: 1-202-622-5000. Toll Free: 1-800-829-1040. TTY: 1-800-829-4059. Forms: Internal Revenue Service Forms. Government branch: Executive Department Sub-Office/Agency/Bureau