This project will create and encourage the adoption of a FHIR implementation guide that standardizes:

• the capture of information about a patient's physical activity level - specifically the LOINC exercise vital sign (https://loinc.org/89574-8/)
• the diagnosis of patients whose level of physical activity is negatively impacting their current and future health and wellbeing (e.g. using codes from the International Classification of Function, SNOMED or ICD10),
• the creation of care plans with goals and targets to improve physical activity levels
• the ordering interventions to enhance patients' physical activity,
• the supporting information needed for prior authorization and billing insurance for those interventions, and
• data and processes to monitor the impact of those interventions.

The intention is to ensure that supporting and encouraging patient physical activity becomes an integral part of patient health management.

The project is sponsored by the U.S. [Physical Activity Alliance|https://paamovewithus.org]. The project is similar in nature to Gravity's SDOH (Social Determinants of Health) IG. It seeks to support incorporation of aspects of patient lifestyle circumstances that the literature clearly shows are deeply intertwined with health outcomes, but which are not widely tracked and managed by existing systems or provider practice. It will also involve enabling data exchange between clinical systems and new types of service delivery providers that have not historically been part of the patient care loop - e.g. physio therapists, personal trainers, lifestyle coaches, etc. Artifacts and workflows will be based on U.S. Core and Gravity implementation guides.

While this project absolutely has international relevance, the sponsor is U.S.-based and expects to leverage U.S.-specific terminologies, such as CPT codes. Project content should certainly be internationalizable.

This FHIR implementation guide will use the US Core profiles. If this FHIR implementation guide is unable to use a US Core profile, we will follow the Cross Group Projects WG's variance request process, and provide the US Realm Steering Committee an approved rationale for deviation in the implementation guide where applicable.