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Most posterior composite fillings get paid correctly on the coding side and shortchanged on the plan-design side — many dental plans still reimburse tooth-colored composite at the amalgam rate, and practices write off the difference without realizing it wasn't required. This 2026 guide breaks down CDT D2391 through D2394: surface-count coding rules, the exact amalgam-equivalent codes plans use for downgrades, and how a pre-treatment estimate prevents the patient billing surpr