What is the barcode at the beginning of Medical Charge 27?

Bar code of medical insurance electronic certificate. The bar code at the beginning of medical charge 27 is a bar code format in the medical insurance electronic certificate standard issued by the National Health and Wellness Committee. Bar code format consists of two parts, the first part is fixed 27, which represents the coding rules of medical insurance electronic certificate; The second part is the voucher number composed of numbers and letters, which is used to identify the uniqueness of medical insurance electronic certificate.