Slacks implies pants of certain materials which are not part of a suit (jeans are not slacks, and you would not refer to the pair of trousers that came with a suit as slacks.) It is also more common to use slacks to refer to pants worn by women, while men would wear trousers.
Health care safety net providers are those that have a legal mandate or mission to offer medical care to all patients, regardless of their ability to pay, and have a substantial number of patients who are uninsured or on Medicaid.
Fully-insured plans. An administrative service company collects from your company then pays doctors and hospitals for claims. Your health insurance company pays doctors and hospitals for claims. You pay the administrative service company a fee to manage your self-funded program. You pay your health insurance company a monthly premium for each employee contract.