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Gatekeeper

A colloquial term for a primary care physician who is responsible for coordinating patient care and referring the patient to specialists. Many insurance programs, particularly HMOs, require a referral from a "gatekeeper" before covering visits to specialists.

National Plan and Provider Enumeration System (NPPES)

The administrative system for supporting a national plan and provider registry. A comprehensive uniform system for identifying and uniquely enumerating health care providers and plans…