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generic substitution. The dispensing of a drug that is the generic equivalent of a drug listed on a pharmacy benefit management plan's formulary. In most cases, generic substitution can be performed without physician approval.

geographic availability. The number of primary care providers within a given radius of a particular target.

GLB Act. See Financial Services Modernization Act.

GPWW. See group practice without walls.

Gramm-Leach-Bliley (GLB) Act. See Financial Services Modernization Act.

group market. A market segment that includes groups of two or more people who enter into a group contract with an MCO under which the MCO provides healthcare coverage to the members of the group.

group model HMO. An HMO that contracts with a multi-specialty group of physicians who are employees of the group practice. Also known as a group practice model HMO.

group practice model HMO. See group model HMO.

group practice without walls (GPWW). A legal entity that combines multiple independent physician practices under one umbrella organization and performs certain business operations for the member practices or arranges for these operations to be performed. The GPWW may maintain its own facility for business operations or it may hire another company to provide this function. Also known as a clinic without walls.