It's one of the issues we're looking at, but part of the problem with an episodic disability is definitional. Part of the work that the Episodic Disabilities Network is about to undertake is to look at the definitions that are used for the various disability programs--as Martine alluded to, they're quite diverse--and figure how they can encapsulate the issue of episodic disability. I can speak most personally about arthritis, because it's the disease I know most about; many people with arthritis don't meet the definition even though they do have significant episodes of disability.
On October 27th, 2010. See this statement in context.