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People uninsured for any part of 2008 spend about 30 billion out of pocket and receive approximately 56 billion in uncompensated care while uninsured. Government programs finance about 75 percent of uncompensated care. If all uninsured people were fully covered, their medical spending would increase by 122. 6 billion. The increase represents 5 percent of current national health spending and 0. 8 percent of gross domestic product. However, it is neither the cost of a specific plan nor necessarily the same as the government's costs, which could be higher, depending on plans' financing structures and the extent of crowd-out.
Hadley et al. (Tue,) studied this question.