If your insurance doesn't say FSD is excluded then it's included.
That's not really how insurance works.
I
Auto pilot or adductive cruise control is included so why not FSD as you still need your hands on the steering wheel and be in control at all times.
Nobody cares where your hands need to be.
But AP comes standard on all Teslas now (other than the SR).
FSD does not.
If you didn't buy it with the car, it won't appear on your window sticker or original purchase agreement for the car.
If you buy it later as essentially an add-on it may, or may not, be covered at all- depending on your policy and your state (and/or some specific combo of the two as it might vary by either)
Hence why anyone who buys after the car purchase ought speak to their company- among the many possibilities (and this list is not exhaustive)-
It's covered if you tell insurance about it (maybe with a receipt from tesla of some kind)
it's not covered since it didn't come with the car
it's only covered if you add a rider for coverage of an add-on post-purchase, otherwise it's not