Modifier 50: Bilateral procedure
When it is appropriate
Append modifier 50 to report a single procedure code that was performed bilaterally, on both sides of the body, during the same operative session, when the code descriptor itself does not already specify bilateral.
When it is not appropriate
Do not use 50 for a procedure whose own code description already states it is bilateral, or for two different procedures performed on each side; that situation calls for distinct anatomic or side specific modifiers instead.
CMS preference
50 is a bilateral reporting and payment convention rather than one of the modifiers CMS lists as able to bypass an NCCI PTP edit; use LT and RT instead when the situation calls for bypassing a PTP edit based on left versus right side.
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.