Final answer:
The order of payment under COB provisions is determined by the Birthday rule, wherein the health plan of the parent with the earlier birthday in the calendar year pays first, before the other parent's plan.
Step-by-step explanation:
When it comes to determining the order of payment in situations where a person has coverage under more than one health insurance plan, the Coordination of Benefits (COB) provision is applied. The correct answer to how the order of payment can be determined is b) Birthday rule. The Birthday rule states that the health plan of the parent whose birthday (month and day, not year) falls earlier in the calendar year is the primary plan that pays first. For example, if one parent's birthday is May 5th and the other's is August 12th, the plan of the parent with the May 5th birthday would be considered primary.
The other options mentioned do not apply: a) The Unilateral rule is not a commonly recognized term in the context of health insurance COB; c) Contact rule is also not relevant; and d) The Continuation rule generally refers to a provision under COBRA (Consolidated Omnibus Budget Reconciliation Act), which is unrelated to the order of benefit payment determination under COB.