Patients billed for a facility fee for outpatient hospital services will get a clearer explanation of the charge, under legislation taking effect Friday. Connecticut has taken various steps to educate patients about the fees. The latest changes, passed this year as part of a broader health care bill, put further mandates on institutions that charge the fees. Patients have complained they were blindsided by the fees on their medical bills, and patient advocates say the fees are difficult to understand. A facility fee is charged by a hospital or health system for outpatient services provided in a hospital facility, intended specifically to compensate the facility for operational expenses.