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What do E codes help identify in ICD-9-CM?

  1. Main treatment procedures

  2. Primary symptoms

  3. External causes of injury

  4. Genetic conditions

The correct answer is: External causes of injury

E codes in ICD-9-CM are used to identify the external causes of injury, such as accidents, intentional self-harm, poisoning, and other circumstances that result in the patient seeking medical treatment. This information is crucial for tracking injury trends, implementing safety measures, and assessing the effectiveness of public health interventions. The other options (A, B, D) do not pertain to E codes, as they focus on different aspects of medical coding.