Modifier 51
Multiple procedures — when multiple procedures (other than E/M) are performed at the same session
✅ When to Use Modifier 51
Second and subsequent procedures during the same session. Payment is typically reduced to 50% for the 2nd procedure, 25% for the 3rd+.
⛔ When NOT to Use Modifier 51
Do NOT use with add-on codes (they are exempt from multiple procedure rules). Do NOT use with E/M codes. Many payers auto-apply this reduction.
📋 Documentation Requirements
Operative report showing each procedure performed.
Modifier 51 FAQ
What does modifier 51 mean? +
Multiple procedures — when multiple procedures (other than E/M) are performed at the same session
When should I use modifier 51? +
Second and subsequent procedures during the same session. Payment is typically reduced to 50% for the 2nd procedure, 25% for the 3rd+.
When should I NOT use modifier 51? +
Do NOT use with add-on codes (they are exempt from multiple procedure rules). Do NOT use with E/M codes. Many payers auto-apply this reduction.
What documentation is required for modifier 51? +
Operative report showing each procedure performed.
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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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