Medical Coding: What It Is and How It Works
Patricia Aalseth · first published 2008 · ISBN 9780763764814
Aalseth traces how medical coding systems evolved and why they took their current shape. She explains the reasoning behind ICD-10 (why diagnosis codes are nested the way they are) and how the shift from ICD-9 happened. The book treats coding as a logical system rather than a memorization exercise.
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Understanding the history and structure of coding systems is what separates coders who memorize from those who actually code well. This book builds your intuition for how to approach a strange code.