Add to the Overview section (before the line with the acronyms link):   By using the FHIR standard and implementing this guide, providers and payers can enhance their existing technologies, where applicable, for estimating patient costs securely and efficiently using common open web technologies. The anticipated benefit of using FHIR APIs is to enable applications of the Patients’ choice to give greater transparency into patient-specific estimated costs of expected healthcare services and items.  FHIR is being used for consumer access to healthcare related data at significant scale today, and there are regulatory requirements in the form of the CMS Patient Access API for FHIR support for the related use case of post adjudicated claims. Use of an aligned FHIR standard would keep the barrier to consumer adoption relatively low.