As per Canada Revenue Agency (CRA), you can claim eligible medical expenses paid in any 12-month period ending in 2022 and not claimed by you or anyone else in 2021. You could claim any eligible medical expenses if they occurred in a 12-month period that ends in the current tax year. After you enter your medical expenses, TurboTax will prompt you to choose your 12-month claim period. For example, the oldest medical expense you can claim on your 2022 return is from January 2, 2022, using a claim period of January 2, 2022, to January 1, 2023.