The most common remote control codes for a basic Dish Network remote to work with a Panasonic TV are 784 and 512, as of 2015. The correct code depend on the type of remote.
The Dish Network website lists approximately 30 types of remotes that have codes for Panasonic TVs. The basic remote has 61 codes that can be compatible with Panasonic TVs, but seven have the best success rates. The remote codes with the highest success rates for Panasonic TVs are 784, 512, 644 and 734. After programming a code, the best method to test the code is to attempt to turn the TV off and on with the remote control.