Can anyone direct me to some materials on coding Echo's? My office is having a few issues determining when to use 93303 for congenital echos and 93308 limited and/follow-up. I am aware of when to use 93308 for limited but what determines it as a follow-up? Our coding supervisor feels that as long as all of the components are there for a full echo, we should bill a 93307.Also,when to use a 93321 for a limited doppler. Is there something that gives some guide lines for what indicates a 93303? I have been to the ICAEL site and didn't find what I needed. (Our office is on the physicians side).