The linked article mentions Type I specifically also: "The annual cost of insulin for people with Type 1 diabetes in the U.S. nearly doubled from $2,900 in 2012

The linked article mentions Type I specifically also: "The annual cost of insulin for people with Type 1 diabetes in the U.S. nearly doubled from $2,900 in 2012 to $5,700 in 2016, according to the most recent data available from the Health Care Cost Institute." Insulin of this type is used primarily to treat Type I diabetes.