This bill expands healthcare eligibility at the Department of Veterans Affairs to include members of the military reserve components who are not on active duty and not covered by TRICARE Prime insurance. The legislation requires the VA to provide hospital care, medical services, and mental health services to these reserve members, though funding depends on Congressional appropriations. The bill establishes a phased enrollment timeline, requiring the VA to enroll uninsured reserve members by December 31, 2023, and all other reserve members by December 31, 2024, with automatic enrollment for new reserve members going forward. The VA must also conduct a study within 180 days to evaluate ways to improve healthcare access for reserve members and report findings to Congress. The implementation of these changes requires coordination between the VA and the Department of Defense.