CASE STATEMENT IN WHERE CLAUSE

IN MY WHERE CLAUSE, I NEED TO DETERMINE THE FOLLOWING:

(((WHERE
  gl.CashierDate >= @BeginDate AND
  gl.CashierDate < DateAdd(d, 1, @EndDate) AND
 
  IF THE ACCOUNTNUMBER IS '22030000' THEN I NEED TO EXCLUDE THESE TWO  DISBURSEMENTCODE ('670','670A')
  IF THE ACCOUNTNUMBER IS '20350000' THEN I NEED TO EXCLUDE THESE FOUR DISBURSEMENTCODE ('215','215B','305','305A')

  IF THE ACCOUNTNUMBER IS ANYTHING BUT THESE TWO ACCOUNTS, THEN I DONT NEED TO EXCLUDE ANYTHING

Thank you for your help!

  I WANT TO USE CASE STATEMENT FOR THIS BUT NOT CERTAIN HOW TO DO IT.