You are a manager of the billing department at Happy Valley Medical Center. One day you overhear a retired physician discussing use of ICD for coding medical diagnoses with a group of incoming medical students. He complained that his department’s managers were always talking about coding correctly, yet ICD didn’t have the right terms for the types of diagnoses he saw in practice. Briefly explain to the group why ICD might not have had complete domain coverage, and what changes have been made in recent years that might address this issue. Also explain, from a billing perspective, why correct coding is important.