CPT code 77067 identifies screening mammography, bilateral (2 view study of each breast). A patient receives unilateral screening mammography. Which modifier is appropriate to append to this procedure?

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Modifier 52 is used to indicate a reduced service, which is appropriate when only a unilateral screening mammography is performed instead of the bilateral service described by CPT code 77067.

CPT Code 77067 Identifies Screening Mammography, Bilateral (2 View Study