Is it legal to only make partial repairs and pocket the rest of the money for an insurance claim?

I was in an accident and the insurance adjuster just left me with a check for repairs. I definitely need to do some of the repairs but the car is older so I think i can skip a few of the others (like a new door, it still opens). Is it perfectly legal to go to a repair shop and only ask them to make it operational and keep the rest of the money? I can't see why it would be wrong as that amount of damage was actually done. Thanks.