Glossary

g
Gamma knife
Gantry

The movable arm on treatment machine.

GPCI (Geographic Cost Index)

Local cost of living modifier as HCFAi realized that there was a difference in the cost of living; the cost of doing business in various areas within the US. It takes into account the cost of personnel, the cost of office space, equipment costs, the cost of malpractice insurance, and other factors. The GPCI's were established nationwide based upon carrier localities with a maximum variation of +/- 5%. These GPCI factors are applied against the national conversion factor to give a local conversion factor that takes into account higher or lower cost of practice in various geographic regions across the country. The GPCIs are a factor in determining the final reimbursement of various medical procedures nationwide.

Group Number

The unique number assigned to a group health plan to identify members of the plan.

GTV – Gross Tumor Volume

The best clinical estimation of the exact areas of the primary tumor volume.