In labor law a complaint filed by an employee regarding working conditions to be resolved by procedural machinery provided in the union contract. An injury, injustice, or wrong which gives ground for complaint.
Source: U.S. Courts
A complaint about the way your Medicare health plan is giving care. For example, you may file a grievance if you have a problem calling the plan or if you are unhappy with the way a staff person at the plan has behaved toward you. A grievance is not the way to deal with a complaint about a treatment decision or a service that is not covered (see Appeal).