Claim Frequency Code: Original, Replacement, or Void?

When a pharmacy submits another version of a medical claim, the billing team needs to tell the payer how that version relates to the first one. A claim frequency code identifies the intended relationship: a new original claim, a replacement for an earlier claim, or a void that cancels an earlier claim.

Without that information, a payer can treat the second submission as a duplicate or fail to connect it to the adjudicated claim that needs correction. Before choosing any code, confirm what happened to the first submission. Our claims adjudication guide explains the responses that can arrive before and after adjudication.

Start with the earlier claim's state

Ask whether the clearinghouse or payer rejected the first claim before adjudication, or whether the payer accepted it into the adjudication system and assigned a claim control number. CMS describes front-end and implementation-guide edits that can reject an electronic professional claim before the payer evaluates coverage and payment.

A pre-adjudication rejection may need a corrected original submission because the payer never created the claim record that a replacement would reference. An adjudicated claim may need a replacement, void, reopening, reconsideration, or appeal. Check the payer's current instructions against the reason for the change before you choose the route. Do not choose code 7 merely because someone used the phrase corrected claim.

Three relationships can appear in one claim history

1 marks an original electronic professional claim

In the professional electronic claim workflow documented by Montana Medicaid, code 1 identifies an original claim. The billing team uses it when it intends to create a new claim record, not change or cancel a previously adjudicated one. Check the destination payer's companion guide because the allowed values and correction route belong to that payer and transaction.

7 replaces an earlier adjudicated claim

With code 7, the biller asks the payer to use the new claim version in place of the referenced version. Montana Medicaid describes code 7 as a complete replacement. A biller following that instruction sends the corrected full claim, including every line the payer should retain, rather than sending only the changed line as an addendum.

A payer can define a different correction route or ask for a portal transaction, cover sheet, reopening, or reconsideration. Confirm the route before submission, especially when the original claim paid in part, crossed to another payer, or contains a provider, member, or service-date problem.

8 voids or cancels an earlier claim

With code 8, the biller asks the payer to cancel the referenced claim. Pharmacy teams may need this route when the entire earlier claim should not remain in the payer's history. A void is more consequential than changing one field. Confirm that the payer accepts code 8 for the situation, what claim information must match the original, and whether the team should wait for a reversal or confirmation before sending any new claim.

Follow a pharmacy claim through a correction

Suppose a pharmacy submits an illustrative professional claim with two clinical-service lines. The payer accepts it into adjudication and assigns control number A12345. The biller later discovers that the claim carried the wrong rendering provider identifier.

Branch A: replace the claim

The service record supports the correct identifier, and the current payer guide says to send a complete replacement. The biller creates a full corrected version with code 7, retains both service lines, and sends A12345 in the original-reference field required by that payer. Keeping the submitted versions and acknowledgement together lets the next biller check which version the payer received.

Branch B: separate the wrong-payer paths

Now suppose the pharmacy sent the claim to the wrong payer. If that payer rejected it before adjudication, correct the routing and send an original claim to the correct payer; there may be no adjudicated record to void. If the wrong payer accepted or adjudicated the claim and its current instructions require a void, send code 8 to that payer using its control number. The correct payer still receives a separate original claim through its accepted route. Confirm coverage order and filing deadlines before either submission.

The control number connects the versions

Use the claim control number assigned by the payer to the earlier adjudicated claim. Do not substitute the pharmacy's internal claim number or a clearinghouse tracking number unless the payer explicitly identifies that value as its original reference number. Compare the remittance, payer portal, and raw acknowledgement when the systems display several identifiers.

For its electronic adjustment workflow, Montana Medicaid instructs submitters to put 7 or 8 in CLM05-3 and the payer-assigned claim control number, often called the ICN or DCN, in REF with qualifier F8. Treat that mapping as a concrete payer example. A pharmacy claim number or clearinghouse tracking number does not replace the payer's identifier. Verify the current companion guide for every other destination.

Paper and electronic claims use different fields

On the paper 1500 claim form, the NUCC instruction manual places the resubmission code and the payer-assigned original reference number in Item 22. It lists 7 for replacement and 8 for void or cancel, says the field is not intended for original claim submissions, and directs billers to the current public or private payer instructions. For an original electronic 837P, code 1 can appear in CLM05-3 when the payer requires it. For an original paper CMS-1500, leave Item 22 blank.

A practice-management screen may label these fields differently from the outgoing claim. Inspect the actual 837P output or a clearinghouse claim image when the payer says the relationship code or control number is missing. A value saved in the user interface does not prove that the transaction carried it to the correct segment.

If the payer still treats the new submission as a duplicate, compare the actual relationship code and payer control number with the payer's instructions before sending another version. The CO-18 duplicate denial guide explains how to find the claim the payer may already have on file.

Choose correction, appeal, or review before the filing clock expires

Use a replacement only when the pharmacy is correcting claim data and the payer supports that route. If the submitted claim matches the record but the pharmacy disputes the payer's coverage or payment decision, use the payer's reconsideration or appeal process instead of code 7. A corrected claim does not automatically restart timely filing. UnitedHealthcare's 2026 guide applies its original filing window to corrected claims, while Medicare generally requires the initial claim within one calendar year of service. Record the rule that applies to this payer and service date. Pause when the earlier claim state, correction route, deadline, control number, or supporting evidence is unclear.