Medical billing clearinghouses are simply middlemen that take electronic medical claims information and then submits that information electronically to insurance companies that they are contracted with. So how does this impact you as a prospective medical billing business owner? Look at it this way: Your client sends you a medical claim in superbill format, you input that information into your medical billing software, you print out that information on to a CMS1500 form, you mail that form out to the appropriate insurance carrier, the insurance company checks the claim for any errors, if everything.