A federal audit has found hundreds of millions of dollars in potentially improper Medicaid payments for autism-related services in four states. The Department of Health and Human Services identified millions of improper or incorrect payments tied to supposed autism care in Indiana, Wisconsin, Maine and Colorado. The audit found up to $600 million in Medicaid benefits were paid out across those four states, with potentially improper billings that included services that did not include therapy and payments for patients who were not properly diagnosed with autism. The Centers for Medicare and Medicaid Services has issued a nationwide call for all 50 states to re-evaluate providers and remove those deemed illegitimate.