Pursuant to a legislative requirement, GAO reviewed the Health Care Financing Administration's (HCFA) new rule on inpatient hospital deductible and hospital extended care services coinsurance amounts for 1999. GAO noted that: (1) the new rule would announce coinsurance amounts for services furnished in calendar year 1999 under Medicare's hospital insurance program; and (2) HCFA complied with applicable requirements in promulgating the rule.