My employer offered me insurance because I worked more than 120 days with more than 30 hours per week. I accepted the health insurance and they take money from my paycheck for it.
Can my employer cut my hours under 20 hours a week?
An employer can cut back hours, but once you qualify for employer health insurance they must offer coverage until the end of the calendar year. This is true even if hours are cut.
In other words, an employer can cut back an employee's hours after offering them health insurance based on full-time status, but it won't result in the employee losing health coverage for the year.