For Americans with diabetes, being enrolled in a high-deductible health plan (HDHP) substantially increases the risk of not taking prescribed medications due to cost, according to a new study conducted by researchers at Harvard Medical School that was published today in the Journal of General Internal Medicine. HDHPs, which now account for half of all commercial health insurance plans, require patients to pay for all care out of pocket until a plan’s deductible is reached. Only after the deductible is reached (typically $1,300 for an individual and $2,600 for a family) does insurance begin to cover medical costs.