Default coding for Osteoarthritis

caquay

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Can anyone tell me if there is any literature that tells what the default codes are for osteoarthritis (unspecified, primary, secondary)? I have heard default is primary, I have heard you have to go to unspecified. Can anyone provide me with any proof/literature to support their position?

i.e. For an xray report if the finding was osteoarthritis of the wrist, would you code M19.03- or M19.90? Why?

Thanks in advance!
 
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