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What do the letters after a Social Security Number mean?

The codes following a Social Security number indicate the type of benefits you are entitled to. The Social Security number followed by one of these codes is often referred to as a claim number and they are only assigned once you apply for benefits. 

For example, if your Social Security number is 123-45-6789, then once you apply for retirement benefits, your claim number is 123-45-6789A. This number will also be used as your Medicare claim number, once you are eligible for Medicare.

Code

Identification

A

Wage Earner (Retirement)

B

Wife

B1

Husband

B2

Young Wife

C1-C9

Child - Includes disabled or student child

D

Aged Widow

D1

Widower

D6

Surviving Divorced Wife

E

Widowed Mother

E1

Surviving Divorced Mother

E4

Widowed Father

E5

Surviving Divorced Father

F1

Father

F2

Mother

F3

Stepfather

F4

Stepmother

F5

Adopting Father

F6

Adopting Mother

G

Claimant of Lump-Sum Death Benefits

HA

Wage earner (disability)

HB

Wife of disabled wage earner

HB1

Husband of disabled wage earner

HC

Child of disabled wage earner

M

Uninsured – Premium Health Insurance Benefits (Part A)

M1

Uninsured - Qualified for but refused HIB (Part A)

T

Uninsured - Entitled to HIB (Part A) under deemed or renal provisions

W

Disabled Widow

W1

Disabled Widower

W6

Disabled Surviving Divorced Wife


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