Modifier RT: Right side
When it is appropriate
Append RT to identify that a procedure was performed on the right side of a paired organ or structure, including to bypass an NCCI PTP edit when the paired column one and column two codes were performed on opposite sides during the same session.
When it is not appropriate
Do not use RT for midline structures without a left or right distinction, or when both services were actually performed on the left side.
CMS preference
RT (with LT) is one of the anatomic modifiers CMS explicitly lists as able to bypass an NCCI PTP edit for genuinely opposite side procedures.
Retrieved 2026-07-18.
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DenialPath provides billing and administrative guidance based on published CMS and X12 sources. It is not medical advice, not a coverage determination, and not a guarantee of payment. NCCI and MUE edits are republished quarterly and payer policies vary by contract. Always confirm against the payer's own current policy before submitting or appealing.