Social security reduction. The reason why the corporate supplementary medical insurance of Bank of Communications was discontinued was due to the reduction of social security personnel. This can be negotiated with the enterprise. Bank of Communications (English name Bank of Communications, abbreviated BCM, Chinese name abbreviated as Bank of Communications) was founded in 1908. It is one of the six largest banks in China. It is also one of the oldest banks in China and one of the note-issuing banks in modern China. It is a state-owned Large commercial banks.