What are a non-custodial parent's obligation for medical expenses?

Question Details:

Last year I gave sole custody to my ex-husband due to the fact that I had serious medical issues going on. There was a prior agreement that we would split co-payments and such. I do not pay child support and he will not communicate with me as to how my daughter is doing nor will she speak to me because of the custody change (she is 15). Additionally, he excludes me in any decisions. Recently he has incurred medical expenses on our daughter's behalf and is demanding that I to pay those and other co-payments; this after over 6 months of me not paying anything. Am I obligated to pay these costs?

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