One of the advantages for employees in a group health plan is the contribution most employers make toward the cost of the health coverage premium â in many cases, employers pay one-half or more of the monthly premium for an employee.
The basic format consists of five decimal numerical digits. An extended ZIP+4 code, introduced in 1983, includes the five digits of the ZIP code, a hyphen, and four additional digits that determine a more specific location within a given ZIP code. The USPS provides a free online lookup tool for ZIP codes.
ZIP+4 Codes are the last 4 digits of a nine-digit ZIP Code. A complete, nine-digit ZIP Code consists of two parts. The first five digits indicate the destination post office or delivery area. The last 4 digits represents a specific delivery route within that overall delivery area. All 9 digits of a full zip code assist the USPS in effectively sorting the mail.