What is a corrected claim?
A corrected claim replaces a claim the payer already processed, fixing an error such as a code, modifier or missing number. It's sent with frequency code 7 and the payer's original claim number.
CLM*CLM00418*320***11:B:7*Y*A*Y*Y~Frequency code 7 in the place of service field: this replaces a prior claim.REF*F8*2026031488731~The payer's claim number for the original claim being replaced.CLM*CLM00418*0***11:B:8*Y*A*Y*Y~For comparison, frequency 8 voids the original claim entirely.When a claim was processed with wrong information, sending it again as a new claim usually gets it denied as a duplicate. A corrected claim tells the payer to replace the original.
How it’s sent
- Frequency code 7 in the claim, meaning replacement of a prior claim.
- The payer’s original claim number, in REF F8 on an 837 or box 22 on a paper claim.
- The whole claim, with every line, not only the line that changed.
Frequency 8 voids a claim, for example one sent to the wrong patient or payer.
Correct or appeal?
A correction fixes your error: a wrong code, a missing modifier, a missing authorization number. An appeal disputes the payer’s decision on a claim that was right. Sending a correction when an appeal was needed, or the other way around, wastes the window for the right one. Many payers also set a shorter deadline for corrected claims than for new ones.
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