Millennium Challenge Compact Improvement Act (MCIA) - Amends the Millennium Challenge Act of 2003 to authorize under specified circumstances: (1) Millennium Challenge Compacts in excess of five years; and (2) concurrent Compacts.
States that assistance may be provided through a Compact with a country individually and/or through a Compact with two or more countries in the same geographic region collectively.
Sets forth provisions regarding suspension or termination of regional Compacts.