Modifiers describe special circumstances without changing the definition or meaning of the code used to report services. Modifiers are added to CPT or HCPCS codes. Modifiers are like playing Monopoly.

CMS has added 13 new modifiers and extended the one of one, as indicated in the January 2011 Integrated Outpatient Code Editor. Most of the new modifiers went into effect Jan. 1, but one new modifier ...