Modifier LT
Left side (used to identify procedures performed on the left side of the body)
✅ When to Use Modifier LT
All procedures that can be lateralized — injections, surgery, imaging on a specific side.
⛔ When NOT to Use Modifier LT
Do NOT use with bilateral modifier 50.
Modifier LT FAQ
What does modifier LT mean? +
Left side (used to identify procedures performed on the left side of the body)
When should I use modifier LT? +
All procedures that can be lateralized — injections, surgery, imaging on a specific side.
When should I NOT use modifier LT? +
Do NOT use with bilateral modifier 50.
What documentation is required for modifier LT? +
Complete chart documentation supporting the modifier's clinical or billing rationale.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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