Celia- this is incorrect unless you are using the term "contract"in a very unusual way. 
"The Alaska Area Indian Health Service works in conjunction with Alaska Native Tribes and Tribal Organizations to provide comprehensive health services to 141,921 Alaska Natives (Eskimos, Aleuts, and Indians). Approximately 99% of the Alaska Area budget is allocated to Alaska Native Tribes and Tribal Organizations who operate under the authority of the Indian Self-Determination Act Education Assistance Act,  and Public Law 93-638, as amended. The Alaska Area maintains 14 Title I contracts with Alaska tribes and tribal organizations, and negotiates one Title V compact with 25 separate tribal funding agreements each year. The Alaska Tribal Health Compact is a comprehensive system of health care that serves all 228 federally recognized tribes in Alaska. " https://www.ihs.gov/Alaska/
The contracts are WITH YKHC, et al to provide care.