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What is the purpose of brackets in the alphabetic index of ICD-9-CM coding?

  1. Identify principal diagnosis

  2. Organize secondary codes

  3. Sequence coding order

  4. Represent underlying condition and manifestation

The correct answer is: Represent underlying condition and manifestation

In the alphabetic index of ICD-9-CM coding, brackets are used to link together the underlying condition and its manifestations. This is important for accurate coding as it helps in identifying the relationship between the main condition and any associated manifestations or complications. By using brackets, coders can ensure that all relevant codes are captured to provide a comprehensive picture of the patient's condition. This is why option D is the correct answer. In contrast, options A, B, and C are not the primary purpose of brackets in the alphabetic index of ICD-9-CM coding.