Why not just apply for it (via myWelfare) and let SW tell you whether or not you qualify? Your doctor will need to send certification electronically in to SW for your claim.
Edit: this thread might also be of interest...
I am currently on sick leave from a public service job due to a heart problem and my specialist has advised that due to the nature of my work duties, I will be unfit for work for the foreseeable future until treatment takes full effect. I am receiving illness benefit of 196 euro p/w and the...
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