medical coding

For which of the following scenarios would it be appropriate to query the physician for more information before coding and/or sequencing? A.A patient was admitted with severe abdominal pain. At discharge, the physician documents the following diagnosis: abdominal pain due to either hiatal hernia or diverticula. B.A patient was admitted with congestive heart failure (treated with IV furosemide) and unstable angina (treated with nitrates). C.A patient has low potassium levels noted on the laboratory report (treated with orally administered potassium). D.A patient is admitted with dysuria with no cause found.