After you file

@Murray6 If you itemize deductions when you amend then you will have a Schedule A with those deductions.  That will be included when you send in your amended return.  But you do NOT send in letters or invoices from doctors, etc.  In your original question you mentioned doing that.   The IRS does not ever want to see your doctor bills or letters from doctors, etc. with your tax return so not sure why you have ever been sending those in the past.   If you are claiming itemized medical expenses then only the total of the expenses ends up on the Schedule A along with your other itemized deductions such as your mortgage interest, property tax, etc.  Again...it is very difficult to claim medical expenses.   Unless you have enough other itemized deductions that are enough to exceed your standard deduction, the medical expenses will have no effect.

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