The health care industry is moving toward a major change in the code set, or language, used to report the reasons why a physician or health care professional provided care to a patient. Since 1978, the ICD-9-CM code set has been used to report these diagnoses. Within the next few years, the code set will be changing to ICD-10-CM. While there are many similarities, there are changes that those in the health information management profession (and those getting ready to enter this profession) must know and understand. With the use of color-coded text, this Quick Study guide helps make the transition easier to understand and simpler to incorporate into work behaviors.