PurposeThis paper aims to: analyze the challenge of health services fragmentation; present the attributes of integrated health service delivery networks (IHSDNs); review lessons learned on integration; examine recent developments in selected countries; and discuss policy implications of implementing IHSDNs.Design/methodology/approachA literature review, expert meetings, and country consultations (national, subregional, and regional) in the Americas resulted in a set of consensus‐based essential attributes for implementing IHSDNs. The analysis of 11 country case studies on integration allowed for the identification of lessons learned.FindingsStudies suggest that IHSDNs could improve health systems performance. Principal findings include: integration processes are difficult, complex, and long term; integration requires extensive systemic changes and a commitment by health workers, health service managers and policymakers; and, multiple modalities and degrees of integration can coexist within a system. The public policy objective is to propose a design that meets each system's specific organizational needs.Research limitations/implicationsThe analysis presented in this paper is qualitative.Practical implicationsSome policy implications for implementing IHSDNs are presented in the paper.Originality/valueThe research and evidence on integration remains limited. The paper expands the knowledge‐base on the topic, presenting lessons learned on integration and recent developments in selected countries, which can support integration efforts in the region.

Introduction: Despite existing initiatives to integrate health services in the Americas Health Care fragmentation remains a significant challenge. Excessive fragmentation leads to difficulties in access to services, delivery of services of poor technical quality, inefficient use of resources, increases in production costs, and low user satisfaction. To address this problem, the Pan American Health Organization (PAHO) has launched the Integrated Health Services Delivery Networks (IHSDN) Initiative to support the development of more accessible, equitable and efficient health care models in the Region [1].Theory/conceptual framework: IHSDN are defined as a network of organizations that provides, or makes arrangements to provide, equitable, comprehensive, and integrated health services to a defined population and is willing to be held accountable for its clinical and economic outcomes and the health status of the population served. IHSDN require 14 essential attributes for their adequate operation grouped according to four principal domains: model of care, governance and strategy, organization and management, and financial allocation and incentives [1].Methods: An extensive literature review, expert meetings and country consultations (national, subregional and regional) in the Americas resulted in a set of consensus-based essential attributes and policy options for implementing IHSDN. Results and conclusions:The research and evidence on health services integration remains limited; however, several studies suggest that IHSDN could improve health systems performance. Principal lessons learned include: i) integration processes are difficult, complex and long term; ii) integration requires extensive systemic changes and a commitment by health workers, health service managers and policymakers; and iii) multiple modalities and degrees of integration can coexist within a single system. The public policy objective is to propose a design that meets each system's specific organizational needs [1].