The Cardiovascular Credentialing International (CCI) credential Registered Cardiovascular Invasive Specialist (RCIS) credential is the globally accepted achievement for allied health professionals who assist in cardiac catheterization procedures. RCIS credential holders include technologists, nurses, and other allied health professionals. As of September 2019 over 8,000 individuals hold an active RCIS certification and over 25,000 individuals are credentialed across CCI’s nine certification programs.