Keith Hall says one source of uncertainty is how insurers would react to the effects of waivers. Keith Hall (Photo: CBO)

The head of the Congressional Budget Office has told one of the agency’s critics in the House that predicting how the lawmaker’s Affordable Care Act (ACA) change proposals would work is hard.

Keith Hall, director of the Congressional Budget Office, gave the CBO’s side today in a public letter addressed to Rep. Tom MacArthur, R-N.J.

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