A coordination of benefits provision is included in group health insurance to reduce:

Detailed Answer in Step-by-Step Solution:

The coordination of benefits (COB) provision prevents overinsurance (B) by ensuring that total payments from multiple group plans don’t exceed 100% of covered expenses, avoiding duplication.

It doesn’t affect dependent coverage (A), probationary periods (C), or waiting periods (D), which are unrelated to claim payments.

The Virginia study guide describes COB as a mechanism to coordinate payments among multiple insurers, reducing overinsurance and ensuring fair claim distribution. Reference: Virginia Life, Annuities, and Health Insurance study guide, section on "Group Health Insurance Provisions."