Thousands of Keystone Mercy Health Plan subscribers are being notified that they will not be able to use Crozer-Keystone Health System hospitals or doctors after April 30 because of a contract dispute. In news releases, health insurer Keystone Mercy said it was losing $1 million a month on its Crozer contract, while the health system said Keystone Mercy was demanding payment cuts of $12 million, or 14%. Crozer said it would be "unconscionable to jeopardize hard-fought financial stability" of the system. The two have been negotiating since 2008.