The Civilian Health and Medical Program of the Department of Veterans Affairs (CHAMPVA) is a health benefits program in which the Department of Veterans Affairs (VA) shares the cost of certain health care services and supplies with eligible beneficiaries. In general the CHAMPVA program covers most health care services and supplies that are medically and psychologically necessary.
Further reading –
https://www.military.com/benefits/veterans-health-care/champva-overview.html