ICD-10-CM Review Exercises: Introduction to Coding 1. Identify the difference between assigning a number to a verbal description such as for a zip code and the activity of assigning a diagnosis or procedure code to medical documentation. 2. How often must the ICD-10-CM and ICD-10-PCS code books be updated and when do the updates go into effect? 3. What did the statistician John Graunt develop in the seventeenth century that is consider an early classification system? 4. Between 1838 and 1893, what other early classification systems were developed? (Continued on next pag