Mine were refered for ages, I waited 7 months for my visa when it was taking 2 months for other spouse visas at the time.
I have epilepsy, have had brain surgery to remove part of my temporal lobe, take medication and will for life. And other smaller stuff like surgery on my knee twice.
I got my visa in the end by convincing them that I was not going to be a drain on Australia. Here is what my CO asked for....
Before giving an opinion on whether you meet the health requirement, HOC has asked that you provide the following further information:
A Current assessmenr by a neurologist is required regarding the applicant’s epilepsy please. Report dated 14/1/09 indicates Dr ****** was to review the applicant in February 2009. Please forward further report addressing physical examination findings, diagnosis, management needs (including surgery) for the next 5 years and prognosis.
They ask for 5 years because thats the period they assess costs over because you could reasonably be a citizen in that time when costs wont matter any more. I had already sent a letter from my GP and statutory declaration about my health and saying how I worked so would be liable for my own medication etc.
So I would advise including similar stuff before being asked.
The people I have seen declined have sadly been a lot of kids with development disorders, ASD conditions mainly. And one person who was taking super expensive drugs for a kidney problem, there may be others but you I cant remember.
Its all about the cost of your potential treatment including expensive medications, welfare payments, social care support etc.