|In general, most of the changes were of the following types:
- 1. Grouping of codes – Conditions have been grouped in a more logical fashion than in ICD-9.
- 2. More complete descriptions – In ICD-10, the subcategory titles are usually complete so that the coder does not have to read previous codes to understand the meaning of the code.
- 3. Fifth and sixth characters – Fifth and sixth characters are incorporated into the code listing rather than having common fifth digits listed at the beginning of a chapter, section, or category.
- 4. Laterality ICD-10 incorporates laterality of conditions or injuries at the fifth or sixth character level.
- 5. Increased specificity – ICD-10 offers expanded detail for the various conditions.
- 6. Excludes notes – There are three kinds of excludes notes that are used in ICD-10.
- 7. Use of extensions – Extensions are used in ICD-10 to provide additional information. Most often found in the injury codes.
- 8. Combination codes – There are numerous codes in ICD-10 that group etiology and manifestation. In ICD-9 generally two codes are required.
- 9. Terminology used – Many of the category code or subcategory code titles have been ICD-9, changed to reflect new technology and more recent medical terminology.
- 10. Postprocedural conditions – There are many more codes added to ICD-10 to describe postoperative or postprocedural conditions.
Doctors, third-party payers and coders will need to be more aware of what documentation is needed to correctly assign codes and trained in the use of the new classification system.