When it comes to creation and maintenance of medical billing codes, then the AMA (American Medical Association) handles the same. The ICD Codes are maintained by the WHO (World Health Organisation).
The adviser panel at the AMA reviews and updates the codes on a yearly basis. CPT or Current Procedural Terminology is regulated by the AMA and Fee Schedule decides how much should be paid for each CPT or service. It is important for the medical billing companies to follow the trends that are set by the American Medical Association.
Reputed medical billing companies such as 24/7 Medical Billing Services work with the best coders who stay updated with the latest in the coding world.