How to claim returns for unclaimed medical re-imbursements?

Hello,

I have submitted medical bills amounting to 4000/- to my employer in Jan, 2013.  Later some extra medical expenses got incurred during Feb, Mar 2013 (around 6000/-).  I have those bills with me.

I do understanding on this extra amount of 6000/- also, I should get tax exemption (as the max is 15000/-).  But my employer had given tax exemption only for 4000/- as I didn't submit those bills (for 6000/-) at that time.

Now, I am submitting the IT returns.  I believe I can get the returns for the extra tax deducted.  I am filling the ITR excel sheet available in incometaxefiling, but didn't understand where to specify this extra amount for the purpose of returns.

Can you help me understand the procedure to get the tax exemption on the additional medical bills incurred (6000/-)?

Thanks.