There are 12 Medicare suffix letters found at the end of Medicare claim numbers. The most common one is A, a retired wage earner and primary claimant. Other common suffixes are B, the spouse of a claimant, and C, the child of a claimant, according to Medicare Mall.
Some other common suffixes include D, the widow of a primary claimant; E, the widowed mother of a primary claimant; F, the parent of a primary claimant; and H, eligible for Medicare due to a disability, explains Medicare Mall. A second suffix can follow primary letters other than the suffix letter A to further specify the description of the claimant's relationship to the primary claimant. There are 33 common suffixes and many less common ones.
Some suffixes, such as B, can consist of just a suffix letter or include a suffix letter and a modifying number. The code B by itself indicates a wife of a primary claimant, but B1 indicates the husband of a primary claimant. Some suffixes must include a number, such as the suffix C, which indicates the child of a primary claimant and must include a number indicating whether it refers to the first child or second, and so on, reports Medicare Mall.