We have a parenting plan that designates all health decisions as "jointly made." The other parent previously had our child on their employer insurance plan. They just changed jobs and hence insurance plans, and simply informed me that our child will be on a new plan, far more costly than the last, and that I am obligated to pay my share of the increased premium cost as an "uninsured medical expense" that we are indeed obligated to share under our parenting plan.
I'm mostly concerned with whether the other parent can make this decision without consultation/agreement. They maintain that since they already have child on their insurance, they can make this change without consultation, and that "joint decision making" on health issues only applies to health care and not insurance.
I simply maintain that when a significant change or action takes place related to health, the decision needs to be jointly made.
Jurisdiction is Washington State.