No, physicians are affiliated with a physician’s group NPI through the normal provider enrollment process. The claims for physician groups are submitted using a Professional Claim (837P) format. However, if the physicians are also attending physicians on the hospital’s 837I Institutional Claims, the hospital must report them as affiliated providers with the appropriate hospital NPI. (Note: For providers using ePACES, the attending provider is referred to in ePACES as the servicing provider.)