From what I understand, that part of the coding conventions will not change - if there are additional digits available, you use them. The first three are your category; 4, 5 and 6 are etiology, anatomical site, and severity; 7 is the extension. If the additional digits are available, you use them. One big difference is, let's say a code has a 7th character that must be used, but no 5th and 6th; you would use x as a place holder to add that 7th.
So, with the codes you are referencing, L71 is the category; since there are 4th characters, you would use one of them.
Hope this helps.
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