Good work. #18 is a cool rending of the check mark. #17 Could be a Q with the check mark inside of it and credentialed provider rounded around the top with a small Centipede at the bottom.
Try to make Credentialed Provider the dominant verbiage, followed by CENTIPEDE. Consider rounding this into a seal and using gold or goldenrod in the design. Providers will post this seal on their website to show that they meet quality standards.