Section 16.03.09.165 - COST-SHARING01.Co-Payments. When a participant accesses certain services inappropriately, the provider can require the participant to pay a co-payment as described in IDAPA 16.03.18, "Medicaid Cost-Sharing."02.Premiums. A participant can be required to share in the cost of basic plan benefits in the form of a premium as described in IDAPA 16.03.18, "Medicaid Cost-Sharing."Idaho Admin. Code r. 16.03.09.165