Final answer:
To be eligible for a Medigap plan, a person must be enrolled in both Medicare Part A and Part B. Part A covers hospital expenses, while Part B covers non-hospital healthcare costs.
Step-by-step explanation:
To join a Medigap plan, an individual must first be enrolled in both parts of Original Medicare, Part A and Part B. Medicare Part A covers hospital charges and is funded via payroll deductions and employer contributions, involving deductibles and copayments with no total cost limits. Medicare Part B is an optional program covering non-hospital healthcare costs like physician services and medical tests, with participants paying monthly fees, deductibles, and copayments. Once enrolled in both Medicare Part A and Part B, individuals are eligible to choose a Medigap plan to help with costs that Original Medicare does not cover.