Medicare Benefit Improvements Act of 1990

Medicare Benefit Improvements Act of 1990 - Amends title XVIII (Medicare) of the Social Security Act to cover screening mammographies for women over age 34 at a frequency which varies on the basis of a woman's age and risk of developing breast cancer. Covers up to 80 hours of annual in-home respite care furnished to an individual who has incurred expenses equal to a specified Medicare Part B (Supplementary Medical Insurance) cost-sharing limit and, for the preceding three months, has been unable to perform at least two specified daily living activities without the assistance of an uncompensated primary caregiver with whom he or she resides. Covers nursing care and home health aide services as home health services if such services are needed less than seven days each week or are needed for up to 38 consecutive days. Amends part A (Hospital Insurance) of the Medicare program to create an extension period of hospice care for terminally ill beneficiaries which is to follow the two 90-day periods and the subsequent 30-day period of hospice care coverage currently provided in an individual's lifetime. Increases the Medicare part B premium.