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A porcelain crown claim can be clinically perfect and still get paid at a lower rate — not from a coding mistake, but from an alternate-benefit clause most offices never see coming until the EOB arrives. This 2026 guide breaks down CDT code D2740: the documentation that actually prevents denials, the date-of-service detail that trips up experienced billers, and why a predetermination is the single best protection against a downgraded crown claim.