The suffixes on a Medicare number are codes that tell Medicare under whose Social Security number you are being given benefits,and your relationship to that person. It is called the Beneficiary Identification Code (BIC).
A Social Security number followed by A tells Medicare that the person filing is the retired or disabled worker who paid into the system and is drawing on his/her own Medicare benefits. B signifies the wife (over age 65) of the primary Social Security number.
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A Social Security number followed by A tells Medicare that the person filing is the retired or disabled worker who paid into the system and is drawing on his/her own Medicare benefits. B signifies the wife (over age 65) of the primary Social Security number.
To see what the entire list of suffixes visit this website: http://ssa-custhelp.ssa.gov/app/answers/detail/a_id/1366/~/meaning-of-the-letters-after-a-social-security-or-medicare-number