See link: https://www.irs.gov/taxtopics/tc502, This tells you what medical bills you can deduct.

Just look at your clients situation. He owned home. Home was sold, doesn't matter if forced to sell or sold voluntarily. Money from his home was used to pay medical expense, therefore if it was a medical expense allowed in pub 502 it would be a deductible medical expense for your client. As far as sale of home, and using sec. 121 exclusion, see link:  https://www.irs.gov/taxtopics/tc701