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https://en.wikipedia.org/wiki/Teleplay

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Accordingly, story and teleplay will appear as distinct credits on a television script if different people played those roles in the script's creation; if the same person or people performed both roles equally (unless they also worked on the concept with one or more people not directly involved in writing the script or developing the story concept), then the story and teleplay credits will not be used and instead a merged "written by" credit will be given.[2] However, a "written by" credit may be given to only three people maximum; if more than three people were involved, then the credits must distinguish those who were "story" contributors from those who were "teleplay" contributors.[2]