The shift toward FHIR (Fast Healthcare Interoperability Resources) is reshaping how New York healthcare organizations exchange data. CMS interoperability rules, value-based care programs, and patient engagement platforms all increasingly require FHIR R4 API capabilities. Zerosums Technologies provides FHIR development services that help New York health systems, payers, and digital health companies meet these requirements. Our FHIR engineers design and build patient access APIs, provider directory feeds, payer-to-provider data exchange pipelines, and SMART on FHIR application integrations. We work with HL7 FHIR R4 resources including Patient, Encounter, Observation, MedicationRequest, Condition, DiagnosticReport, and more — mapping them accurately to source data from Epic, Cerner, MEDITECH, and other EHR platforms. For New York payers and health plans, we support CMS interoperability and prior authorization rules including the Patient Access API, Provider Directory API, and Payer-to-Payer Data Exchange requirements. We also support New York State's value-based payment initiatives and the data exchange needs that come with APM and DSRIP successor programs. For health systems and digital health vendors building SMART on FHIR applications, we provide API design, FHIR server configuration, OAuth 2.0 / SMART authorization flows, and application integration with major EHR launch frameworks.