If for some reason the carrier does not accept electronic claims, the clearinghouse mails a paper version of the claim.A medical biller's most important skill includes filling up of the various medical forms correctly without any mistakes what so ever. All information required should be complete without any mistake at all. There are many medical billing training programs and schools that orient the billing candidates to the different insurance rules, medical billing software and familiarize them with the medical environment.The author of this article is Ricci Mathew of Outsource Strategies International (OSI), a US based company that offers services in Medical Coding, Medical Billing, Medical Transcription for clients across the US.