ICD-10: Use This Map to Navigate Your ICD-10-CM Manual

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Note:  The following article synopsis was NOT provided by AAPC. It was created by Find-A-Code/innoviHealth.

Article Overview

This article explains how to read the ICD-10-CM manual and highlights the main ways its Alphabetic Index and Tabular List are organized. It is aimed at coders and other revenue cycle professionals who need a practical orientation to ICD-10-CM structure, chapter layout, and external cause reporting concepts. The article also touches on broad differences from ICD-9-CM and points readers to the types of references and categories they will encounter in the manual.

Why This Topic Matters

Understanding the layout of ICD-10-CM helps coders locate diagnoses more efficiently and recognize how the code set differs from ICD-9-CM. This kind of orientation supports accurate code lookup and faster adaptation to the manual's chapter structure and indexing conventions.

Article Sections

  1. Check Out the Alphabetic Index

    Introduces the Alphabetic Index and the types of references found there. Also notes broad ICD-10-CM changes affecting index structure and drug and chemical tables.

  2. Don't Miss This Big ICD-10 Alphabetic Index Change

    Describes major organizational differences in the ICD-10-CM indexing of injury and external cause information. The section emphasizes how related material is grouped across chapters.

  3. Now Check Out the Tabular List

    Explains how the Tabular List is arranged into chapters and how those chapters are organized. It also outlines general differences from ICD-9-CM chapter structure.

  4. How to Decipher Code Categories

    Summarizes the general format of ICD-10-CM categories and subcategories in the tabular portion of the manual. The section focuses on code length and hierarchy at a high level.

What You Will Learn

  • How the ICD-10-CM Alphabetic Index is organized
  • How the ICD-10-CM Tabular List is structured
  • What broad changes distinguish ICD-10-CM from ICD-9-CM
  • How diagnosis categories and subcategories are formatted in ICD-10-CM
  • What kinds of external cause information may appear in ICD-10-CM

Who Should Read This

  • Medical coders
  • Coding students
  • Revenue cycle staff
  • Health information management professionals

Codes Discussed


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