Cousin of Disorder is as severe, painful, & debilitating is listed as a Disability. Why isn't Ehlers Danlos listed too?

Ehlers Danlos Syndrome (EDS) affects the "Glue" holding a body together. It’s similar to Marfan Syndrome, listed a Disability in the Social Security Admin’s (SSA’s) List of Impairments or 20 CFR Part 404, Subpart P, Appendix 1 (http://www.ssa.gov/disability/professionals/bluebook/4.00-Cardiovascular...)
Vascular Type is most dangerous; it causes blood vessels, organs, arteries, intestines, etc to tear. Hypermobility is the most painful & debilitating. It causes our joints to have Subluxations, Chronic Pain, & Abnormal Motion of the joints, as the SSA’s criteria states in 1.02 Major dysfunction of a joint(s) of the SSA’s List of Impairments (http://www.ssa.gov/disability/professionals/bluebook/1.00-Musculoskeleta...) Why isn’t EDS a Disability, when Marfan Syndrome is?