Sutter Health & Aetna Joint Health Plan Begins in 2019 September 21, 2018 General Contracting The new joint venture health plan between Sutter Health and Aetna will begin offering care in Alameda and Contra Costa counties on January 1, 2019. Providers should verify their participation in the new network and member eligibility before seeing patients with the Sutter Health | Aetna ID cards. Questions about eligibility may be directed to the toll-free number on the member ID card or the Provider Service Center at (888) 632-3862, or by going to www.sutterhealthaetna.com.