If a patient is seen and treated at one facility and the treating physician is working under that group's credentials and Place of Service then the treating physician leaves the practice and is now billing under his own credentials and his new Place of Service, and he is now trying to clean up his old accounts receivable and finds that some of the older visits at the other facility were not billed out. Can the doctor resubmit the old claims and Place of Service under his new Place of Service and credentials? My gut tells me that if the patient was seen at a completely different office location and under the previous facilities NPI, TIN, etc. he can not change the Place of Service and replace it with his own credentials.