In October 2015, coders transitioned from ICD-9 to ICD-10. Therefore, it's important to have a firm understanding of the types of instructional notations that you'll find in ICD-10. Test your knowledge of several important ICD-10 coding conventions by answering each of the following questions:

1. What's the difference between "Excludes1" and "Excludes2" in ICD-10-CM?

2. When should a coder assign placeholder "x" for a code in ICD-10-CM?

3. List and explain the three levels of indentation used in the Alphabetical Index of the ICD-10-CM manual.