[Answered]: When determining the primary insurance carrier…

When determining the primary insurance carrier for individuals with multiple health coverages, following the Coordination of Benefits (COB) rules established by the Centers for Medicare & Medicaid Services (CMS) is essential. In the case of Ron Polonsky, a 71-year-old retiree covered by Medicare Part B and as a dependent on his wife’s employer group health plan, the primary payer depends on the size of the employer sponsoring the group health plan. According to CMS rules, if a person age 65 or older has group health coverage as a dependent from a spouse’s current employment, and the employer has 20 or more employees, then the group health plan pays first (primary) and Medicare pays second (secondary) (Valerius et al., 2023, p. 284). Since Sandra works as a high-school science teacher and her coverage is through the State of Nebraska’s group health insurance plan, it is reasonable to assume the employer qualifies as a large group health plan (more than 20 employees). Therefore, Sandra’s employer-sponsored plan is Ron’s primary insurance carrier, while Medicare is secondary. This coverage order is part of the Medicare Secondary Payer (MSP) program, which coordinates benefits to prevent duplicate payments and ensure the correct payer is first billed. The MSP program protects Medicare funds by making Medicare the secondary payer when another valid insurance plan exists (Valerius et al., 2023). In Ron’s case, claims should first be submitted to Sandra’s group health plan. After that, any remaining eligible balances (such as deductibles or coinsurance) may be submitted to Medicare Part B, administered by Blue Cross and Blue Shield of Kansas in Nebraska.