Medical Coding Practice Test

Which of the following is true regarding the use of brackets in ICD-9-CM coding?

1. They signify optional information

2. They are always sequenced as principal diagnosis

3. They represent the manifestation of the underlying condition

4. They indicate primary diagnosis category

The correct answer is: They represent the manifestation of the underlying condition

Brackets in ICD-9-CM coding represent the manifestation of the underlying condition. This means that the code inside the brackets specifies a more specific or detailed description of the diagnosis, which may help with treatment or reimbursement. Option A is incorrect because brackets are used for necessary, not optional, information. Option B is incorrect because brackets do not have a specific sequencing requirement. Option D is incorrect because brackets do not indicate primary diagnosis category; that is determined by the code before the decimal point.