G9140 HCPCS - FRONTIER EXTENDED STAY CLINIC DEMONSTRATION; FOR A PATIENT STAY IN A CLINIC APPROVED FOR THE CMS DEMONSTRATION PROJECT; THE FOLLOWING MEASURES SHOULD BE PRESENT: THE STAY MUST BE EQUAL TO OR GREATER THAN 4 HOURS; WEATHER OR OTHER CONDITIONS MUST PREVENT TRANSFER OR THE CASE FALLS INTO A CATEGORY OF MONITORING AND OBSERVATION CASES THAT ARE PERMITTED BY THE RULES OF THE DEMONSTRATION; THERE IS A MAXIMUM FRONTIER EXTENDED STAY CLINIC (FESC) VISIT OF 48 HOURS, EXCEPT IN THE CASE WHEN WEATHER OR OTHER CONDITIONS PREVENT TRANSFER; PAYMENT IS MADE ON EACH PERIOD UP TO 4 HOURS, AFTER THE FIRST 4 HOURS