Claims guide

Corrected Claims: How to Replace or Void a Claim the Right Way

Corrected claims are claims you send again to change or cancel one the payer already has. This guide shows when to send a replacement or a void, which code to use, and which claim number the payer needs. It is written for therapists, psychiatrists and the staff who bill for them.

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What corrected claims are

A corrected claim changes or cancels a claim the payer has already received.

Corrected claims fix data on a claim that was accepted into the payer system. A typo in a diagnosis code, a wrong modifier, a missing service or a wrong rendering provider are common reasons. The payer does not edit the old claim for you. You send a new claim that points back to the old one.

There are two kinds. A replacement claim swaps the old claim for a new, complete one. A void (also called a cancel) removes the old claim and asks for nothing in its place. Together they are the two ways to send corrected claims, and each has its own code.

Corrected claims are not appeals. If the payer denied the claim for a reason such as medical necessity, the data was right and the payer disagreed, so you appeal. See the claim denials and appeals guide. If the claim was rejected before the payer accepted it, there is usually nothing to correct on the payer side. Fix the error and send it as a new claim, and confirm with the payer or clearinghouse.

Why it matters: a wrong correction can deny as a duplicate or leave the original claim untouched, and the payer clock keeps running. Read the ERA and EOB guide first so you know what the payer actually did with the original.

Code 7 and code 8: the two corrected claim codes

The code tells the payer what to do with the old claim.

Resubmission and frequency codes for corrected claims
Code	Name	What the payer does	When to use it
7	Replacement of prior claim	Replaces the earlier claim with the full new claim.	Something on the claim was wrong or missing, and you want it paid as corrected.
8	Void or cancel of prior claim	Removes the earlier claim from the payer record.	The claim should never have gone out: wrong patient, wrong payer or a true duplicate.

On the paper CMS-1500, the code goes in Item 22 with the payer-assigned original reference number. The NUCC manual says Item 22 is not for original claim submissions and tells billers to check payer rules. See the CMS-1500 guide for the whole form. On an electronic 837P claim, the same code travels as the claim frequency code, and the original claim number travels in loop 2300 with qualifier F8.

Two Blue Cross licensees spell out the rule the same way. A replacement must include every service you want reconsidered, and a void must list every charge from the original. If the code is missing or wrong, the claim denies and the original is not adjusted. Other payers differ, so check each one.

Which fix needs which route

Match the error to the right action. This table is operational guidance, so confirm it with the payer.

Common claim errors and the usual route
Error found	Usual route	Note
Wrong diagnosis code, modifier, units or charge	Replacement (code 7)	Send the full corrected claim.
Wrong date of service or place of service	Replacement (code 7)	Some payers want a void and a new claim. Ask first.
Service left off the original claim	Replacement (code 7)	Include every line, old and new.
Wrong rendering or billing provider	Replacement (code 7) or void	Depends on the payer and on what was paid.
Claim sent for the wrong patient or payer	Void (code 8)	Then send a new original claim to the right place.
Duplicate claim paid twice	Void (code 8)	Or return the overpayment as the payer directs.
Denial for medical necessity or authorization	Appeal, not a corrected claim	The data was right. See the claim denial terms.

7 steps to send corrected claims

To submit a corrected claim, find the payer claim number, fix the error, set code 7 or 8, send the complete claim, and watch the result.

Read the ERA. Find the payer claim number (some payers call it the document control number) on the 835 or the payment summary.
Decide the route. Corrected claim, appeal or new claim? Use the table above.
Fix the error in your billing system. Change only what is wrong and keep the rest identical.
Set the code. Choose 7 to replace or 8 to void.
Add the original claim number. Paper uses Item 22. Electronic claims use the claim number segment with qualifier F8.
Send the whole claim, not only the changed line. Use the same route the payer or clearinghouse accepts for corrected claims.
Track it. Log the date, the old and new claim numbers and the payer response. Corrected claims have their own filing limits, so do not wait.

Practices that send many corrected claims can use the same steps each time. Our billing services include claim follow-up for psychotherapists and psychiatrists, and the claims processing glossary defines each term used here.

Medicare, Medicaid and private payers

These three rule sets differ. Do not assume one payer works like another.

Private payers

Rules are set by each payer and each Blue Cross licensee. Two licensees, Blue Cross and Blue Shield of Illinois and of Texas, require the original document control number in loop 2300 REF02 with F8 in REF01, and they reject or deny corrected claims without it. Read your payer contract and provider manual. The private insurance guides link to payer detail by name.

Medicare

Medicare Part B contractors generally handle changes to a processed claim through a reopening instead of a replacement claim. CMS describes a reopening as a discretionary action, separate from an appeal. A clerical error, such as a transposed code or a wrong modifier, can be reopened. Reopenings are allowed within one year for any reason and within four years for good cause, and a decision not to reopen cannot be appealed. A reopening cannot be used to add a service that was never billed. Your Medicare contractor sets the exact form or portal step, so check its site.

Medicaid

Medicaid corrected claim rules vary by state, and many states set their own forms, codes and time limits. Use your state Medicaid provider manual and bulletins. Never apply one state's rule to another.

State and federal law

Timely filing and overpayment rules can also come from your contract and from state law. Confirm anything with real financial exposure with counsel or a compliance officer. This page is operational guidance, not legal advice.

What to do Monday morning

Pull every denial or underpayment caused by a data error on the claim.
Split them: corrected claims, appeals and new claims.
Write the payer claim number next to each one before you touch the claim.
Send replacements (code 7) with the full claim, and voids (code 8) with every original charge.
Log the send date and set a follow-up. Check the CPT & E/M code guide or the reimbursement terms if a code or term is unclear.

MCM South works corrected claims and denials every week for psychotherapists and psychiatrists. See the practices we serve or the Billing Terms Glossary.

Frequently asked questions

What is a corrected claim?

A corrected claim is a claim you send again to change or cancel one the payer already has. A replacement uses code 7 and a void uses code 8. Both must point to the payer claim number of the original.

What is the difference between a replacement and a void?

A replacement swaps the old claim for a new, complete claim. A void removes the old claim and nothing replaces it. Use a void when the claim should not have been sent, and a replacement when it needs fixing.

Do I need the original claim number to send corrected claims?

Yes, in most cases. Paper claims carry it in Item 22 and electronic claims carry it with qualifier F8. Two Blue Cross licensees reject or deny corrected claims that lack it, so check each payer.

Can I send corrected claims to Medicare?

Medicare Part B contractors generally use reopenings for changes to a processed claim. CMS allows clerical error reopenings within set time limits. Check your Medicare contractor for its exact form or portal step.

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