Cfwarrior86,
I see your mutation, 2789+5g<-A, is a Class 5 with some Residual function. My mutation, D1152H, is a Class 4, also with Residual function.
Even people with the same mutation appear to respond differently to Kalydeco - so I can only give you my experiences.
My reaction to it has been phenomenal! I saw dramatic changes less that a day after taking my first dose. My mucus became much thinner and I started bringing up a ton of what looked like old dark sputum. After a few days the coughing almost completely stopped and thank G-d, really hasn’t returned in the 3 ½ years I’ve been taking Kalydeco. I haven’t required any IV antibiotics and have only needed Cipro a few times. Also, there haven't been any negative side affects that I'm aware of.
As for cost, my co-payments are considerable. I too am on a Medicare plan through Social Security. In 2017, these plans require 5% co-pay after an outlay of $4950. Kalydeco costs close to $300,000 a year. The 5% amounts to a yearly outlay of over $14,500!
I’ve never considered looking for other health insurance since mine is provided through my wife’s ex-employer. It’s really great in terms of cost and most coverage. Also, I’m not sure if there are any decent “Medicare” health plans that would provide better all-around coverage, including for Kalydeco.
Co-pay assistance organizations do exist. Some are income based. “Fortunately” my income is above the level for which they will supply assistance.
Others co-pay assistance organizations would not provide assistance for off-label drugs. Until recently, I was taking Kalydeco off-label. When my mutation recently received FDA approval I again contacted some of the co-pay assistance organizations that did not have an income related test. I was told that federal law prohibited them from providing assistance to anyone with a Medicare drug plan.
All things considered, I am not complaining!
I do hope that Kalydeco ends up working for you, and that whatever your costs are you can cover them. Do explore the co-pay assistance organizations. Your circumstances may be such that they can make Kalydeco very affordable. You should also check with Vertex’s GPS program. You CF doctor will have to register you with Vertex before they’ll talk with you, but they can give you some advice. They also provide assistance under some circumstances.
Hopefully in the near future there will be a drug that provides the help for everyone with CF like Kalydeco has for many us us.
Good Luck!