What document is provided to each employee participating in an employer health plan?

The correct answer is the certificate, which is a vital document provided to each employee participating in an employer-sponsored health plan. It serves as evidence of the individual's insurance coverage and outlines the benefits and coverage details of the health plan. The certificate typically includes information on what medical services are covered, the extent of coverage, and any limitations or exclusions that may apply.

Having a certificate ensures that employees are aware of their rights and responsibilities under the health plan. This document can also be instrumental when employees seek medical services, as it acts as proof of insurance to healthcare providers and helps them understand how to process claims related to the insurance coverage.

While the insurance policy outlines the complete agreement between the insurer and the employer, it is not typically provided directly to employees; rather, it is maintained by the employer. The summary plan description describes the plan's benefits and features in greater detail and is also important but is not the primary document given to each employee. The enrollment form is used for employees to sign up for the health plan, but it is not a document that outlines coverage—rather, it collects necessary information for the enrollment process.