An MCO shall qualify for protection under the Stop Loss Program if: It was participating in HealthChoice as of April 1, 1999; It was unable to self-insure or obtain a contract with another entity for Stop Loss reinsurance after July 1, 1999; and By July 1, 1999, the MCO requested the Department to continue to provide Stop Loss Protection at a rate determined by the Department. An MCO shall notify the Department that the acute inpatient hospital costs of an enrollee are expected to exceed the Stop Loss limit as soon as it knows that this is likely to occur. Upon confirming eligibility for stop loss protection, the Department shall assume liability for reimbursement of 90 percent of accrued acute inpatient hospital charges according to established Medicaid fee-for-service rates for medically necessary acute inpatient treatment rendered to the enrollee above the stop loss limit throughout the remainder of the calendar year. An MCO shall remain financially liable for reimbursing 10 percent of accrued acute inpatient hospital charges for medically necessary treatment rendered to the enrollee above the stop loss limit throughout the remainder of the calendar year, and shall maintain full responsibility for the provision of health care services to the enrollee. At the beginning of the next calendar year, an MCO shall reassume full financial responsibility and full discretion for developing medical treatment plans for any enrollee who qualified for the Stop Loss Program. The Department's Extended Stop Loss Period. If an inpatient enrollee remains hospitalized at the end of a calendar year and incurs acute hospital costs that exceed the Stop Loss limit into the following calendar year without interruption, the Department's stop loss period shall be extended until the end of that hospitalization. The MCO shall remain financially liable for costs up to the Stop Loss limit for enrollees who remain hospitalized in an acute setting at the end of the calendar year as specified in §§A and D of this regulation until the enrollee is discharged. For calendar year 2001 and beyond, the MCO shall submit the MCO's Stop Loss Reinsurance Plan or Self-Insurance Plan to the Maryland Insurance Administration. If an MCO chooses to have the Department provide its Stop Loss coverage, an adjustment will be made to the capitation amount the MCO is paid. Upon the termination of the provider agreement between the enrollee's MCO and the Department, if an MCO has failed to fulfill its financial liability under this regulation, the Department shall assume responsibility only for costs that exceed the Stop Loss limit as specified in §C of this regulation.