In order to give more specificity to the cause of a problem, the letters E and M are used in ICD-9-CM. What is the letter E used to identify?

Question

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The letter E is used to identify the cause of a wound or other injury in ICD-9-CM. For example, E codes may be used to specify whether a wound was caused by a fall, an accident in the workplace, or some other external factor.

In Order to Give More Specificity to the Cause of a Problem