Wiki code for pulmonary nodule

Can anyone clarify the difference between ICD 9 code 793.11 and 518.89. Which one is correct for a Pulmonary nodule?

It appears 793.11 is a new code and it describes a solitary pulmonary nodule, so that would be correct if that is what is described in the chart note. If it is unknown if there is a nodule or some other disease process going on, then the less descriptive 518.89 would seem to be more appropriate.
 
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