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The issue of community and separate property isn't really an issue when it comes to this. It's not that they "don't separate" it into different categories, it just doesn't make any difference whether they do or not for reimbursement of this type of government claim.
However, there may still be something to try.
What I'd suggest you do is visit with a local lawyer that does estate planning and explain your situation and ask them about potential trusts. There are some kinds of trusts that can be established which protects assets even from governmental claims. It's better to do it as far in advance as possible but trusts work a little different than just giving assets away or other things people sometimes try to protect their assets.
If your question has been answered completely then I'd offer my best wishes to you and ask that you please not forget to leave a Positive Rating so I receive credit for my work.
Of course, please feel free to ask any follow up questions in this thread.
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