Co-insurances are a kind of financial responsibility. This is the kind of scenario and setup that is typical of PPO plans. 

Co-insurance shares are typically a percentage of the fees charged. So if a doctor's fees end up being $100 for the day, and your co-insurance share is said to be 20%, your financial responsibility would be—? You guessed it: $20. 

See also:

  • Did you know that it's illegal for physicians not to try to collect your co-insurance or any kind of financial responsibility from you?—be it a deductible, co-pay or whatever. It is! And it's considered a form of healthcare fraud. Read this. 

  • More on PPO plans

  • More on financial responsibility