How can I include if statements in this code?

select

SiteID,Name,ProgramID,POSSession,POSSessSummDate,PMealsSumm,RMealsSumm,FMealsSumm,FreeCount,

ReducedCount,PaidCount,ErrorCode='Claim Exceeds Eligibility',ReportName='Edit Check',MealType=' ',ItemID=' '

fromEDIT_CHECK_V1

where(FMealsSumm>FreeCountorrMealsSumm>ReducedCountorPMealsSumm>PaidCount)

and

IFFMealsSumm>FreeCount

ErrorCode='Free Claim Exceeds Eligibility'

ELSE

IFrMealsSumm>ReducedCount

ErrorCode='Reduced Claim Exceeds Eligibility'

ELSE

ErrorCode='Paid Claim Exceeds Eligibility'