A client is admitted with chest pain. a series of diagnostic tests are ordered, and the client undergoes coronary artery bypass grafting. the cost of care for this client is increased because of a four-pack-per-day smoking history that resulted in extension of the client's intensive care unit (icu) stay by 3 days because of respiratory problems. the case manager realizes that under the terms of the diagnosis-related group (drg) payment system for this diagnosis: