This notice refers to your recent letter regarding the amount of your medical insurance
            bill.
         
         The Social Security Act requires that medical insurance premiums be paid l month in
            advance. The initial billing covers premiums for months beginning with the first month
            of coverage up to and including the third month of billing; subsequent billings are
            for periods of 3 months.
         
         Our records indicate you received a bill for $ (1)  covering payment  (2)  through  (3)  . Since your first month of coverage was  (4)  , the bill is correct.
         
         You should submit your premium payment immediately if you have not already done so
            to avoid loss of coverage.
         
          
         If You Have Any Questions 
         3901C
          
         Enclosure: 
         Envelope