Denial

What can you do when your ADHD partner refuses to believe there is anything wrong with him and that it is everyone else who has the problem?  He agreed to go for an evaluation and was told he may or may not have ADHD based on a test he did on a computer.  The therapist said he could not prescribe any meds even if he did have ADHD because he has an alcohol dependency problem.  A catch 22!  Now we are back to square one.  When I mention ADHD, he just says, "I thought we already covered this...there's no problem."  Any advice for an ADHD denier?