Codebusters offers a FREE, yes FREE, ICD-10-CM & PCS Training Course at Training Course It is a "ICD-10 Training Online Course by Linda Kobayashi, RHIT, CCS: The focus is on Inpatient coding, covering diagnosis and procedure codes extensively. Conditions and complications from all 22 chapters of ICD-10-CM and associated procedures are rigorously covered through life-like coding scenarios. The full course is broken up into two sections, the first covering ICD-10-CM Chapters 1-9 and the second covering Chapters 10-19 (External cause codes are present as secondary diagnoses throughout the course)." PCS is used for inpatient procedures (in the hospital). Check out their Course Flyer