Did you enter a 1095-A for Marketplace insurance?  Or a SSA-1099 for Social Security?

Does your client itemize, so it would matter?  Does your client have enough medical expenses that it would be exceed the 7.5% limit for Itemized deductions?  If not, I would just ignore it.

You could delete the K-1 to check if it does away, then re-enter the K-1.  But that may be too much work.  If you don't think it is a valid deduction, you could just enter a negative amount to offset it (but I realize you may be trying to figure out IF it is a valid deduction or not).