Bicycles are on of the most often stolen items due to their ease of transport and relatively high value. They are also often locked up with flimsy bike locks outside of the house.
Fortunately, they are usually covered under most home insurance policies, whether they are actually stolen from the house or while parked somewhere else.
The bad part is that most likely the deductible will be way higher than the value of the bike, so you will most likely not receive any money.
If your bike is especially valuable or you have special concerns, you should consult your insurance agent.