Coordination of benefits (COB) applies to people who have coverage under more than one health plan. COB refers to which plan is the primary (first) payer and which plan is the secondary payer. The primary payer coordinates the delivery of all health plan benefits. The secondary payer covers what the primary payer doesn't cover on costs and benefits.
Dual Special Needs plans (D-SNPs) are a type of Medicare Advantage plan. As such, the D-SNP coordinates the delivery of both the Medicare and Medicaid benefits. In most cases, Medicaid covers benefits and costs the D-SNP doesn't cover. D-SNPs also coordinate care management, disease management and other clinical services.