I can not get the if statement correct, get syntax correct enough that I do not get errors but it is not given me the results I should be.  I know there is data that should be counted but it is not.  If the CPTCategory is not one that is listed I want to count it.

if IsNull({spOIA_DailyExamFlashSummary.CPTCategory})
    OR
(
 {spOIA_DailyExamFlashSummary.CPTCategory} <> "CT"
    AND {spOIA_DailyExamFlashSummary.CPTCategory} <> "Bone Density"
    AND {spOIA_DailyExamFlashSummary.CPTCategory} <> "Fluoroscopy"
    AND {spOIA_DailyExamFlashSummary.CPTCategory} <> "Mammography"
    AND {spOIA_DailyExamFlashSummary.CPTCategory} <> "MRI"
    AND {spOIA_DailyExamFlashSummary.CPTCategory} <> "PET"
    AND {spOIA_DailyExamFlashSummary.CPTCategory} <> "Special Procedures"
    AND {spOIA_DailyExamFlashSummary.CPTCategory} <> "Plain Film/ Xray/ CR"
    AND {spOIA_DailyExamFlashSummary.CPTCategory} <> "Ultrasound"
    AND {spOIA_DailyExamFlashSummary.CPTCatID} <> 6
)
Then
    {spOIA_DailyExamFlashSummary.ExamCount}
Else
    0