Health Savings Account Copay

[DadOf_LnR]

We all live in CA. I am the non-custodial dad of two children and I must provide the health insurance. I do this through a health savings account, HSA.

Our divorce order says that we split medical costs. But, no one knew about HSA's back then.  

My question:
When full-custody mom takes our children to the doctor, am I responsible for the full copay out of my HSA ?  Or, do I pay half and mom pays half?

-bump-

[MixedBag]

I'm not sure how a HSA works....

Isn't it just a savings account where you put in money and that money is specifically set aside for medical bills and it's PRE-TAX dollars to lower your taxable income???

If so, how can there be a co-pay when there is no insurance claim to process???? and stuff?