Can I deduct medical expenses I pay for an adult child who is not a dependent?

Answer 1

no. you can only deduct medical expenses paid for you, your spouse or a dependent.

Answer 2

You can include medical expenses you paid for your dependent. For you to include these expenses, the person must have been your dependent either at the time the medical services were provided or at the time you paid the expenses. A person generally qualifies as your dependent for purposes of the medical expense deduction if both of the following requirements are met.

The person was a qualifying child or a qualifying relative, and

The person was a U.S. citizen or national or a resident of the United States, Canada, or Mexico. If your qualifying child was adopted, see Exception for adopted child, next.

Qualifying Relative
A qualifying relative is a person:

Who is your:

Son, daughter, stepchild, foster child, or a descendant of any of them (for example, your grandchild),

Brother, sister, or a son or daughter of either of them,

Father, mother, or an ancestor or sibling of either of them (for example, your grandmother, grandfather, aunt, or uncle),

Stepbrother, stepsister, stepfather, stepmother, son-in-law, daughter-in-law, father-in-law, mother-in-law, brother-in-law, or sister-in-law, or

Any other person (other than your spouse) who lived with you all year as a member of your household if your relationship did not violate local law,

Who was not a qualifying child (see Qualifying child above) of any taxpayer for 2006, and

Yes you can claim the Medical Expenses if the above applies
Publication 502
http://www.irs.gov/publications/p502/index.html

Answer 3

If she is not your dependent, no you can't claim medical expenses that you paid for her.

Answer 4

no

sorry