"Covering for" gram negative pneumonia

Does the phrase "covering for" equate to a term of uncertainty for a diagnosis?  For instance if the provider documents,  “Pneumonia – covering for gram negative and atypical organisms," how would you code it?  Do you interpret it to mean "possible" gram negative pneumonia?  Would you query?  If so, how would you word the query?  Please provide resources that support your decision?   
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