What does waiver of collision deductible coverage in California for uninsured motorists coverage?

The California Collision Deductible Waiver (CDW) is coverage which waives your collision deductible if you are hit by a negligent uninsured motorist.

The CDW option with a personal auto insurance policy in California pays your collision deductible when you carry collision coverage on a vehicle that is damaged by an uninsured or hit-and-run motorist who is At Fault. Coverage typically applies only when there is actual physical contact and when you can identify the uninsured driver or vehicle.

Some insurance companies will not even talk about the coverage even if it is included in your policy until you bring it to their attention.