Dexcom & Omnipod cost

I am on a high deductible plan of CIGNA this year. When I fill my prescriptions, the cost for a 90 days supply of insulin is $0, for 90 days Dexcom G7 is $60. However, the cost for a 90 days Omnipod is $1746!

CS says it is because I have a high deductible plan. But why I do not have to meet deductibles for Dexcom and Insulin. Any insights from this sub?