Medical Billing Glossary: Complete A-Z Terms and Definitions

Medical billing terminology spans coding, claims adjudication, payer rules, and revenue cycle operations. Whether you are managing medical billing in-house or evaluating an outside billing partner, understanding these terms is essential for interpreting remittance advice, benchmarking performance, and identifying where revenue is being lost. For a full overview of how these terms connect in practice, see our guide on what is medical billing.

This glossary provides plain-language definitions for every major term used in medical billing and revenue cycle management. Each entry includes the definition, how the term applies to real billing scenarios, and related terms that affect claim adjudication, collections, and compliance.