Wiki Chapter 20 external causes

It is not mandatory in all cases. There are exceptions, For instance certain types of providers are required by state law to report them, Some carriers require them to correctly adjudicate the claim for payment, and if you look at the burn codes they require the place source and intent for compliant reporting. They are not as optional as the guideline appears to make it seem and if you read it thoroughly you will see the guideline even applies that there are exceptions.
I always use the external cause codes for injuries, and with ICD-10 Cm you will carry the mechanism of injury forward to each encounter which is different that ICD-9 CM
 
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