Payment of Dues Blue Shield of California offers a variety of op- tions and methods by which you may pay your dues. Please call Customer Service at the tele- phone number indicated on your Identification Card to discuss these options. Dues payments by mail should be sent to: Blue Shield of California X.X. Xxx 00000 Xxx Xxxxxxx, XX 00000-0000 Additional dues may be charged in the event that a state or any other taxing authority im- poses upon Blue Shield a tax or license fee which is calculated upon base dues or Blue Shield's gross receipts or any portion of either. Benefits designed to cover cost-sharing amounts under Medicare will be changed auto- matically to coincide with any changes in the applicable Medicare-determined Deductible and coinsurance amounts. Dues may be modi- fied to correspond with such changes. Dues are determined based on age of the Sub- xxxxxxx, subject to the right reserved by Blue Shield to modify these dues with at least sixty (60) days notice as set forth in this Agreement.