Reassesment

Ive rang esa theyve said my reassesment is in march this year.
I cant get out dwp have said i need a letter from my doctor stating i cant get out and i need a home visit.
Question i have is this is there a certain dead line i need the letter from. I have rang my doctor today but will this letter still be valid to send  in march or as it got to be dated within a certan time 

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