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.
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Related Modifiers
Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team