The practice of most companies enables the making of the claim to overlap the functions of medical billing and medical coding. The responsibility of the billers is to comply with the company procedures and codes provided by medical coders. Then, it is up to the coders to come up with the correct procedure and diagnosis codes to be used in making the claims.
To be more graphic, the codes for procedures will reflect the services performed by the medical providers. While, the codes for the diseases, like the ICD codes for diagnosis will contain the medical necessity of such treatment. Thus, what the procedure codes aim is to put what services were performed, while the diagnosis codes provide the reason for such services.