The certification period begins the first day of the month in which the eligible child is enrolled in a MCO. Duration of Certification Period. The initial certification period, or the certification period beginning after a period of ineligibility for MCHP Premium, shall end not later than 1 year from the beginning month of certification for MCHP Premium. Notwithstanding §B(1) of this regulation, the certification period may be shortened: If a determination of ineligibility is made; or At the request of the representative. A child who, on the day the child becomes 19 years old, is receiving acute inpatient services under MCHP Premium and who, but for attaining that age, is otherwise eligible for MCHP Premium, shall remain eligible for MCHP Premium until the end of the stay for which acute inpatient services are furnished. Individuals may be certified for a period of continuous eligibility as described in COMAR 10.09.24.12.