The code used to identify the 1st external cause of injury, poisoning, or other adverse effect. This diagnosis E code is also stored as the 1st occurrence of the diagnosis E code trailer.
On October 1, 2015 the conversion from the 9th version of the International Classification of Diseases (ICD-9-CM) to version 10 (ICD-10-CM) occurred. ICD-10 has more than 70,000 unique diagnosis codes compared to approximately 14,000 ICD-9 codes, which allows for more detail surrounding diagnoses.
There are additional E code fields available in this file. The lower the number in the variable name, the more important the diagnosis in the patient treatment/billing (i.e., ICD_DGNS_E_CD1 is considered more important than ICD_DGNS_E_CD9).
Source: Medicare Advantage Organizations (MAOs)