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History of Anatomical codes, why is hand modifier -FA for thumb rather then a number

H

hdavis

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I am try to figure out the history behind why with both hand and foot anatomical hand modifiers that the left thumb is -FA rather then a -F(number) like the rest of the fingers. And same with the toes.
 
All modifier are 2 characters so they cant use F10 or T10. Why left hand doesn't start with F1 and right fifth digit isn't FA, I don't know

Similar with ICD-10 now. They ran out of numbers in a range so for instance after O99 comes O9A
 
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