Medical Coding Practice Test

When are residual subcategories used in ICD-9-CM coding?

1. For preventive services

2. For diagnosis confirmation

3. When the coder has limited information

4. For surgical procedures

The correct answer is: When the coder has limited information

Residual subcategories in ICD-9-CM coding are used when the coder has limited information. These subcategories are meant to be a catch-all for situations where specific details are lacking. By using residual categories, coders can still accurately classify and code the diagnosis or procedure when specific codes are not available or applicable. Options A, B, and D are not correct because residual subcategories are not specifically designated for preventive services, diagnosis confirmation, or surgical procedures. They are primarily used in situations where there is limited information available for precise coding.