Is there authoritative guidance for the frequency of documentation to support oxygen charges within a hospital setting? The research I have found is that this charge has been charged hourly, every 12 hours, daily, or as a bundled charge. Recommendations are to generate the charge based on documented usage of oxygen by the patient and as long as the documentation shows the amount used, it does not matter how the total charge is generated. Is there a total hour threshold to be able to charge a daily oxygen charge?