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A word or group of words that describes or limits a verb, noun, adjective, or adverb. Modifiers applied to nouns are adjectives. Modifiers applied to verbs or adjectives are adverbs. Those that are applied to adverbs themselves are also called adverbs.
Modifiers are two-character suffixes (alpha and/or numeric) that are attached to a procedure code. CPT modifiers are defined by the American Medical Association (AMA). HCPCS Level II modifiers are. defined by the Centers for Medicare and Medicaid Services (CMS). Like CPT codes, the use. ofmodifiers requires explicit understanding of the purpose of each modifier.