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CARC 107 · CO-107

CARC 107 Denial: The related or qualifying claim/service was not identified on this claim — How to Fix and Appeal

Reviewed by QuickIntell RCM Editorial Team · Last reviewed

Updated

TL;DR

CARC 107 (X12 The related or qualifying claim/service was not identified on this claim). CARC 107 indicates the billed service depends on another 'qualifying' service that was not referenced on the claim.

Official X12 description

“The related or qualifying claim/service was not identified on this claim.”

Source: X12 Claim Adjustment Reason Codes. The X12 External Code Lists are the single authoritative source for every CARC descriptor — always verify against the current release before building a claim-scrub rule.

What CARC 107 actually means

CARC 107 indicates the billed service depends on another 'qualifying' service that was not referenced on the claim. Common examples: add-on CPT billed without its primary code, a post-op service billed without the surgical claim number, or a facility claim billed without the professional component identifier. Populate the referenced claim/service and rebill.

Common root causes

  • Add-on code (e.g., +99354, +36415) billed without its required primary procedure on the same claim.
  • Qualifier missing on the 837 (prior claim reference, anesthesia cross-reference, repair-kit parent HCPCS).

Prevention checklist

  • Scrubber rule that blocks add-on codes without a valid primary on the same claim.
  • EDI configuration that auto-populates required claim-reference qualifiers.

Appeal strategy — step by step

Most CARC 107 denials clear faster with the right remediation than with a formal appeal. Work the steps in order and escalate only when a lower-effort path has been ruled out.

  1. 1Identify the qualifying service (primary CPT or related prior claim), populate the reference field, and resubmit.
  2. 2If the qualifying service was on a separate claim, appeal with both claim numbers cross-referenced.
Sample appeal-letter language for CARC 107
[Provider letterhead] Re: Appeal of CARC 107 — Claim #{claim_number} Member: {member_name} · Member ID: {member_id} Date(s) of Service: {dos} On {remittance_date} this claim was adjusted with CARC 107: "The related or qualifying claim/service was not identified on this claim." We respectfully request reconsideration. The X12 External Code List definition of CARC 107 does not apply to this claim for the following reasons: 1. [Cite the clinical / coding / policy fact that rebuts the adjustment] 2. [Cite the supporting documentation attached — op note, EOB, LCD/NCD citation, NCCI edit indicator, modifier rationale] 3. [Cite the payer's own policy where applicable] Attached: {list supporting documents} Please process payment under the member's benefits. If additional information is required, contact the billing office at {provider_phone} or {provider_email}. Sincerely, {billing_manager_name}, {credentials}

Edit the bracketed fields before sending. This template is a starting point; a payer-specific appeal form may still be required — check the provider portal first.

Payer-specific notes

Payer-specific behavior for CARC 107 publishes here as the QuickIntell anonymized denial ETL ingests sufficient volume. In the meantime, consult the payer directory for the relevant provider manual and appeal form.

How common is CARC 107?

Search demand rank
#35

Out of 306 seeded CARCs, ranked by combined US monthly search volume for "CARC 107", "CO-107 denial", and "denial code 107".

Platform frequency
Pending ETL

Platform frequency ranks publish once the anonymized denial-rate pipeline reaches the publication threshold (strategy §12 Phase 2).

How QuickRCM prevents CARC 107

QuickRCM catches the root causes above before the 837 leaves the clearinghouse:

  • Claim-scrub rules fire on every root cause listed above — the scrub references the same X12 CAS segment logic that drives the denial, so what the payer checks, QuickRCM checks first.
  • When a denial lands, QuickRCM routes it to the correct worker with the documentation bundle already attached (op note, LCD citation, modifier rationale, EOB, primary 835).
  • Appeal templates tuned to each CARC (including this one) pull the supporting facts from the claim and fill the bracketed fields automatically.
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Frequently asked questions — CARC 107

What does CARC 107 mean?

CARC 107 is an X12 Claim Adjustment Reason Code. The official definition is: "The related or qualifying claim/service was not identified on this claim." In plain English, the payer is telling you cARC 107 indicates the billed service depends on another 'qualifying' service that was not referenced on the claim. Common examples: add-on CPT billed without its primary code, a post-op service billed without the surgical claim number, or a facility claim billed without the professional component identifier. Populate the referenced claim/service and rebill.

How do I resolve a CARC 107 (CO-107) denial?

Start with the most common root cause: Add-on code (e.g., +99354, +36415) billed without its required primary procedure on the same claim. First step: Identify the qualifying service (primary CPT or related prior claim), populate the reference field, and resubmit. See the full remediation and appeal checklist on this page before filing a formal appeal.

Is CARC 107 patient responsibility?

No — CARC 107 is typically carried under CO (Contractual Obligation) or OA (Other Adjustment), which means it is the provider's responsibility, not the patient's. Do not bill the patient unless the 835 CAS group code is PR.

What does CARC 107 look like on an EOB or 835 remittance?

On the 835 ERA, CARC 107 appears in Loop 2110 CAS segment as "CAS*CO*107*{amount}". On a paper EOB the same code prints in the Adjustment/Denial Reason column with the X12 description: "The related or qualifying claim/service was not identified on this claim." — usually paired with one or more RARC remark codes in the same remittance line for additional context.

Which RARC is paired with CARC 107?

CARC 107 is commonly observed with RARC N122, N19. The RARC narrows the reason — for example, pointing at a missing modifier, an LCD citation, or a specific policy. Fix the underlying CARC first; the RARC usually clears with the corrected claim.

Disclaimer

This page is operational reference for medical-billing professionals. It is not legal, clinical, or contractual advice. X12 code descriptors are maintained by the X12 External Code Lists; always verify against the current X12 release and the payer's own published policy before submitting or appealing a claim.