New York's healthcare organizations depend on seamless data exchange between EHR systems, labs, imaging centers, pharmacies, and health information exchanges. HL7 messaging standards — v2.x, v3, and the FHIR R4 API framework — are the foundation of that interoperability. Zerosums Technologies delivers HL7 integration services tailored to the New York healthcare environment. Our engineers build, test, and maintain HL7 interfaces across all major integration engines including Mirth Connect, Rhapsody, Infor Cloverleaf, and InterSystems HealthShare. We develop ADT feeds, lab result routing, radiology order workflows, scheduling interfaces, and care transition documents. Each interface is documented, tested against real payloads, and monitored for errors after go-live. For New York organizations participating in SHIN-NY, we support the technical onboarding process, including RHIO connectivity requirements, C-CDA document generation, and query-based exchange. We have experience with Healthix, HealtheConnections, and Rochester RHIO connectivity implementations. We also support FHIR R4 API implementations for organizations moving toward modern interoperability standards — including CMS interoperability rule compliance, patient access APIs, provider directory feeds, and payer-to-provider data exchange.