Is fresh cod with worms safe to eat?
Live parasitic worms are to be expected in raw fresh fish, and need to be dealt with in one of three ways:


Cooking: If the fish is thoroughly cooked, the worms will be dead and safe to eat.
Removal/avoidance: A skilled sashimi chef has an eye for parasites, and will either discard contaminated pieces, or remove the parasites.
Freezing: So called "sushi grade" fish is fish that has been frozen at a temperature/duration recommended by the US FDA. That's 7 days at -20°C, or colder for shorter treatments. Note that this is much colder than domestic freezers. It is said to provide a "parasite destruction guarantee".


There may be other ways to neutralise parasites, such as Eskimo-style fermented fish - but these are unlikely to be of use to you.

There is a difference between safety and palatability, though, and your customers might reasonably expect to be served fish without visible parasites.