Aetna U.S. Healthcare

AmeriChoice of Pennsylvania, Inc.

AmeriHealth, Inc.

Cigna Healthcare of Pennsylvania

CorVel Corporation

Devon Health Services, Inc.

First Health Network/Affordable Healthcare

First Priority Health

ForMost, Inc.

Health Care Solutions, Inc.

Health Partners of Philadelphia

Health Payors Organization, Ltd.

HealthSouth Corporation

Horizon Health Plan of NJ

Horizon Health Plan of PA

IPG Health Network, Inc.

Independence Blue Cross

Keystone Health Plan East

Keystone Mercy Health Plan, Inc.

MultiPlan, Inc.

National Provider Network, Inc.

OakTree Health Plan

PHS Health Plans

Personal Choice

Preferred Care, Inc.

Preferred Health Care

Prudential Health Care Plan

Sierra Military Health Services/CHAMPUS

Teamsters Health and Welfare Fund

United Healthcare Insurance Company (LOA)

United Payors and United Providers