Tony ... by 'insuring the kb' do you mean an extended warranty against failure of the instrument, or insurance against theft, fire, etc.
I don't know about the extended warranty, although you can get one for just about any piece of electronic gear, so I wouldn't be surprised if SOMEONE offered an extended warranty for a kb...
As for the other type of insurance, I know that generally in the US, if you use your musical gear professionally, it needs to be specifically insured through your homeowners or other type policy. If you use it only at home, it should be covered by your homeowners policy, just like any other possession.
To be safe, I would have it specifically insured.....
Hope this helps,
t.