FHIR vs REST APIs for Risk Adjustment: An Integration Guide

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In modern risk adjustment infrastructure, APIs are essential for various systems—such as EHRs, claims platforms, and analytics tools—to exchange data. FHIR (Fast Healthcare Interoperability Resources), developed by HL7 International, is a healthcare-specific standard that defines resource types like Patient and Condition. By referencing standard code systems such as ICD-10-CM, SNOMED CT, and LOINC, it ensures interoperability of clinical data. Because FHIR uses a RESTful structure, it lowers the integration barrier compared to older standards like HL7v2. REST (Representational State Transfer) is a general-purpose architectural style for building web APIs; unlike FHIR, it does not define specific data models or healthcare terminology. Custom REST endpoints can be optimized for specific use cases, such as RAF score calculation, allowing high speed without the overhead of standard resource structures. Developers benefit from rapid development and high throughput using custom schemas. The article suggests that while FHIR is suitable for regulatory compliance (like CMS patient access APIs) and standardized data exchange, custom REST is better suited for computationally intensive or highly specific operational workflows.