He is too old to qualify for the child tax credit. You can still claim him as a qualifying child dependent if he meets all the qualifications. You can claim his medical expenses as an itemized deduction on your tax return just as you would claim all medical expenses. Only medical expenses in excess of 7.5% of your Adjusted Gross Income can actually be deducted and the total of all itemized deductions must be more than the standard deduction for you to get a tax benefit.
