Medicare Psychiatric Hospital Prospective Payment System Act of 1999

Medicare Psychiatric Hospital Prospective Payment System Act of 1999 - Amends title XVIII (Medicare) of the Social Security Act to: (1) provide for a prospective payment system for inpatient psychiatric facility hospital services; and (2) exempt such services from certain reductions under the Balanced Budget Act of 1997 (BBA'97), and, instead, limit payment to not less than a certain applicable percentage of the amount that would have been paid if such reductions did not apply.

Provides that the amendments made by this Act shall apply as if included in the enactment of BBA '97.