CMS adds 168 new ICD-9 codesin last major revision before ICD-10

Why This Topic Matters

It helps readers understand the scope and timing of a major ICD-9 update and identify which chapters saw the most change. The article is relevant for historical coding reference, transition planning, and retrospective claim or audit review tied to the 2011 diagnosis code set.

Article Sections

1. Diagnosis coding

   An introduction to the scope of the finalized ICD-9-CM diagnosis code updates and their effective date. It also notes that additional codes were added, revised, or invalidated beyond the originally proposed changes.

2. Key code changes and examples

   A summary of the major categories of diagnosis code updates, including broad clinical areas affected and examples of newly added code groupings. The section also notes selected code name changes and references related guideline updates.

3. Finalized ICD-9 code changes effective Oct. 1, 2011, by code range (chapter)

   A chapter-by-chapter table showing counts of new, revised, and invalidated ICD-9-CM codes across major diagnostic categories. It provides a high-level view of where the largest changes occurred.