I bet he couldn't go to the doctor to have his blood calcium level detected before the stone formed.
I also bet that if you had seen the real bill for his emergency room care, which is either passed on to the taxpayers through public health monies or passed on to the people with health insurance in the form of higher premiums, you would understand the problem a little better.
Passing a stone is painful. I bet he would have preferred well-care that could have helped to prevent it. The uninsured have to truly suffer before they can get care, another cost. Not measurable; beyond price.