What is the 'max out of pocket' on your mother's insurance plan? With many plans I've seen, once you've paid out of pocket X thousands of dollars for the year,

What is the 'max out of pocket' on your mother's insurance plan? With many plans I've seen, once you've paid out of pocket X thousands of dollars for the year, the insurance picks up 100% of the cost, as long as you are seeking treatment at an in-network provider.