Tax Year Prior to 2020: Assisted living can some of this expense be claimed

Yes.  Please see the section on Nursing Services in the following link.   IRS Medical Expenses

For medical expenses to be deducted on the tax return, you must itemize deductions on Schedule A, and your unreimbursed medical expenses must exceed 10 percent of your adjusted gross income (AGI).   Then, you can only deduct the amount by which your unreimbursed medical expenses exceed this 10 percent threshold (7.5% of AGI for age 65 and older until 2017). However, some states allow the full deduction, even if you don't have enough for your federal taxes.

Where do I enter my medical expenses?
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