1. Private indemnity insurance plan or managed care plan that is set up as a separate business unit within another larger organization (e.g., life insurance company, fidelity line, HMO, PPO). The LOB makes a distinction between the managed care plans from the free-standing company or one set up as a subsidiary. 2. Refers to a distinctive type of program within a health plan such as Medicaid. 3. Different types of health plans offered by a large insurance company or insurance broker as a product line.