Modifiers are used in coding and billing to indicate that a procedure or service has been altered but not changed as defined by the code. It is always two characters that help the payer understand the description of the service provided and adds information to expand on specificity. Some modifiers reduce payment due the alteration of procedural circumstances. The coder must appropriately add modifier based on provider documentation as specified on coding guidelines.
This resource is part of the 2022 Medical Coding, Billing and Auditing Toolkit.