Invalid combination of modifiers
Two or more modifiers on the same line cannot be used together.
Usual causes
- Modifiers 26 and TC on one line.
- Modifier 59 with an X modifier (XE, XS, XP, XU).
- Two anatomic modifiers that conflict, or LT and RT on one line instead of 50 or two lines.
The fix
Keep only the modifiers that apply and follow the payer's modifier order; resubmit.
Appeal or corrected claim?
Corrected claim.
Deadline to watch
Timely filing limit.
Exact limits are in your payer contract or provider manual. When in doubt, send the correction or appeal this week.
Often seen together
The modifiers on the line cannot be used together (for example 26 with TC, or 59 with an X modifier). Keep the right one and resubmit.
N519 in short
What does N519 mean?
Two or more modifiers on the same line cannot be used together. The official X12 text reads: "Invalid combination of HCPCS modifiers."
What usually causes a N519 denial?
Modifiers 26 and TC on one line. Modifier 59 with an X modifier (XE, XS, XP, XU). Two anatomic modifiers that conflict, or LT and RT on one line instead of 50 or two lines.
How do I fix N519?
Keep only the modifiers that apply and follow the payer's modifier order; resubmit.
Should I appeal N519 or send a corrected claim?
Corrected claim. Corrected claim.
What deadline applies to N519?
Timely filing limit.