3-2-1 CODE IT! 4E is the premier, easy-to-use medical coding guide for both beginners and experienced professionals. This best-selling textbook begins with diagnosis coding, then builds on this foundation through in-depth instruction on ICD-9-CM, CPT, and HCPCS Level II coding. 3-2-1 CODE IT! 4E prepares readers better than ever for earning a coding credential by using the latest code sets, conventions, and guidelines. This edition also features strategic tips on career advancement that readers will find helpful for years to come.