To estimate the impact of the AHCA, the CBO had to compare it to predictions of coverage under the current law, the ACA. If the prediction for the current law is incorrect the prediction of lost coverage will be too.Yet the CBO has consistently overestimated future ACA coverage gains. In 2012 it predicted an additional 28 million would gain health insurance by 2017. The actual figure is 20 million. It forecast 25 million would gain coverage on the ACA exchanges and 10 million would gain Medicaid coverage. Less than half as many actually enrolled on the exchanges and not all of them gained coverage – many were replacing non-exchange policies they lost after ACA passage. Conversely, about 14 million – 40 percent higher than predicted – newly enrolled in Medicaid. The CBO prediction that 5 million would lose employer coverage was also wrong – employer provided coverage was stable.

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