More than half of Americans with insurance coverage for mental health servi
ces are enrolled in plans that carve out behavioral health care services wi
th a vendor specializing in the management of these services. However utili
zation management has not taken the place of benefit limitations. Do benefi
t limits matter? This article reports the percentage of enrollees in manage
d behavioral health care carve-out plans that encounter benefit limits. Est
imates are provided on the impact and savings of imposing benefit limits an
enrollees in unrestricted plans. Casts to eliminate benefit limits are est
imated to be very small. This study finds that benefit limits do matter but
only to a very small number of plan enrollees. Furthermore, the results of
this study show that for inpatient limits, children are especially vulnera
ble. These issues have important implications for discussions about the imp
act of managed care in mental health and for discussions concerning parity
legislation.