It is recommended for a healthcare provider to halt their services until the entire credentialing process is complete. This guarantees that all patients receive quality care from only those providers who have verified qualification to offer their services. A healthcare organization is putting itself in unnecessary risk by letting non-credentialed individuals work for them.
That being said, there are a few exceptions to the rule. Medical students, for instance, don’t need credentialing as long as their duties to do not cross the scope of their educational program. They typically don’t need to undergo credentialing as they are working under the strict supervision of superior credentialed providers.