The easiest way to find a VA claim number is to look in the upper right-hand corner of any mail or other documentation received from the Department of Veteran Affairs, explains Lender VA. The letters "C," "XC," "CSS" or "XSS" proceed the VA claim number.
In some cases, the Department of Veteran Affairs assigns the Social Security number of the claimant as the claim number. If written correspondence from the VA is not available, it is possible to call the VA's toll-free number and retrieve the claim number by providing the veteran's Social Security number, says VA Lender. Sometimes, use of the person's Social Security number is acceptable in place of the claim number.