As the number of claim on health insurance is increasing at about 13% per year from 1997 to 2004, medical institutions and HIRA (Health Insurance Review & Assessment Service) have been adapted the charge process electronically for medical bill to reduce cost and prevent the duplicated work. We analysis how medical institution workers have satisfaction with the system and which factors influencing workers and research what we should consider when new electronic bill system is introduced. Through this, we can look to ways for improving the electronic bill system and provide fundamental references to develop innovative bill system in future.We have summary of results from comparing and analyzing how health insurance electronic bill system was utilized in 2000 and how it has been changed currently. First, in electronic bill system satisfaction, the previous research examined normal but the current result shows that 82.4% workers of entire medical institutions are satisfied. It tells that electronic charging job is mostly stable. Second, in cost improvement, the previous one had effects that earning interest, reducing labor charge, reducing cost of issuing charge bill, but the current one also have shortened pay period, reducing labor and so on. Both of them have similar effects. Third, in charge fee, the previous one expected 65% reducing with fee per month but as current results, hospitals more than general hospital scale expect 20% reducing, normal size of hospitals expect 25% reducing and small size of hospitals expect 40% reducing. We can expect consistent cost reducing and can draw innovative cost reducing way with introducing new electronic bill system in future. Four, in time consuming satisfaction of clinic fee payment, the previous one expected to reduce 15 days as improving 92.7% but the current result shows that only 6.3% people pay the bill in 15 days. We need policy supports to activate payment process utilizing for management-efficiency and economical stability in medical institutions. This research has several limitations. We couldn't separate works as physicians, nurses and administrate staff for proper satisfaction levels in each medical institutions. Also, we couldn't analysis it each time period evenly since the electronic bill system is introduced. We need policy supports to activate payment process utilizing for management-efficiency and economical stability in medical institutions. This research has several limitations. We couldn't separate works as physicians, nurses and administrate staff for proper satisfaction levels in each medical institutions. Also, we couldn't analysis it each time period evenly since the electronic bill system is introduced. The future new electronic bill system should reflect how level customer, medical institutions expected to be information-oriented. Also it should have advanced techniques with reasonable price and convenient charge method as minimizing confusion among medical institutions. To achieve the above goals, we expect the government invest this economically and technically and then we can be sure to have renovation of health insurance system in 5 year.