That's weird. My mom was diagnosed with BPD and she had full coverage on Medicaid. I'm really unsure about the SSI, though. I'll ask around with the more educated folks I know, and see what I can find.
What is it you're looking to get covered? Prescriptions, check ups, therapy? I know there are tons of prescription aid programs (only way I can get my meds right now), and your local health department might know of organizations that can help with therapy costs, or even free support group.
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"Your pain is the breaking of the shell that encloses your understanding. Even as the stone of the fruit must break, that its heart may stand in the sun, so must you know pain." Kahlil Gibran