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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.
Anesthesia Modifiers. What is a modifier and whatâs the purpose of its use? A modifier is a two-position alpha or numeric code appended to a CPT code to clarify the services being billed. Modifiers provide a means by which a service can be altered without changing the procedure code. They add more information, such as the anatomical site, to the code.