Please contact Costco Health Solutions Customer Care toll-free at the number listed on your pharmacy benefit member ID card. TTY (toll-free): 1-877-908-6024 Hours: 24 hours a day, 7 days a week. Member Feedback. To provide any member feedback, please contact CHSMemberFeedback@costco.com. Sales General Sales Inquires: 1-425-416-4115 SShults ....