In the case of physicians working exclusively in a hospital setting on either a full-time basis or as a part of their normal practice for a specified period of time (e.g. weekly hospital rotations among a practice group) off hours premium benefits may be claimed in accordance with the GRs for those claims as long as the claiming physician is the attending physician or is primarily responsible for the patient's care, or is claiming concurrent care in accordance with GR 4.8. In the case of physicians working in an AACC or UCC, off hours premium benefits may be claimed in accordance with the GRs for those claims as long as the claiming physician is the attending physician.