§406.3. Definitions.

First month of entitlement means the first month for which the individual meets all the requirements for entitlement to Part A benefits.

Insured individual means an individual who has the number of quarters of coverage required for monthly social security benefits.

Quarter of coverage means a calendar quarter that is counted toward the number of covered quarters required to make the individual eligible for monthly social security benefits. A quarter is counted if during that quarter (or that calendar year) the individual earned a required minimum amount of money. (For details, see 20 CFR part 404, subpart B.)