Wiki Gustillo "type III" fracture 7th character?

[RobertW]

I have an operative report stating a forearm fracture is "type III" not specifying A, B, or C - how do I code the initial encounter for this?
ICD-10 gives us two choices:

B = Initial encounter for open fracture type I or II
Initial encounter for open fracture NOS
C = Initial encounter for open fracture type IIIA, IIIB, or IIIC

So does "Type III" just become NOS and get coded as B for the 7th character? If so why don't they just describe B as initial encounter for open fracture type I, II, III, or NOS?

 

[RobertW]

Here's the problem - about half the sources I found list 6 possible classifications - I, II, III, IIIa, IIIb, IIIc.
The other half list only 5 - I, II, IIIa, IIIb, IIIc. This seems to be correct.
I hate inconsistent and misleading information.