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RARC N109 · Remittance Advice Remark Code

RARC N109 Remark Code: This claim/service was chosen for complex review and was denied after reviewing…

Reviewed by QuickIntell RCM Editorial Team · Last reviewed

Updated

Not an ICD-10 code. RARC N109 is a remittance-advice remark code published by X12 and carried on the 835 LQ segment. Any ICD-10 code with the same letters and digits (e.g., ICD-10 M15 osteoarthritis, N130 other urinary tract disorders) is a separate, unrelated code set used in diagnoses on the 837. Confirm the context before acting on this page.

TL;DR

RARC N109 (X12 This claim/service was chosen for complex review and was denied after reviewing the medical records). Commonly paired with CARC 50, CARC 125. RARC N109 explains that complex medical review resulted in denial after records review.

Official X12 description

“This claim/service was chosen for complex review and was denied after reviewing the medical records.”

Source: X12 Remittance Advice Remark Codes. X12 publishes and maintains the RARC set; always verify against the current release before building a claim workflow.

Paired CARC codes

RARC N109 almost never appears alone — it accompanies one of the CARCs below on the same 835 remittance line. Fix the CARC and the RARC typically clears; the RARC alone is informational.

Paired CARCWhat the CARC means
CARC 50These are non-covered services because this is not deemed a 'medical necessity' by the payer.
CARC 125Submission/billing error(s). Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.

What RARC N109 actually means

RARC N109 explains that complex medical review resulted in denial after records review. Appeal with additional clinical evidence addressing the specific reviewer findings.

Common root causes

  • Complex review found insufficient clinical support.

Prevention checklist

  • Complex-review readiness — chart completeness for common targets.

Resolution & appeal strategy — step by step

Because RARC N109 is supplemental to a CARC, the resolution path usually starts by fixing the underlying adjustment reason. A formal appeal of the RARC alone is rarely necessary.

  1. 1Appeal with targeted clinical evidence addressing review findings.
Sample reconsideration language referencing RARC N109
[Provider letterhead] Re: Reconsideration — Claim #{claim_number}, CARC 50 / RARC N109 Member: {member_name} · Member ID: {member_id} Date(s) of Service: {dos} The 835 remittance on {remittance_date} carried RARC N109: "This claim/service was chosen for complex review and was denied after reviewing the medical records." We request reconsideration. The attached documentation rebuts the remark code: 1. [State the fact that rebuts the remark — authorization number, primary 835, modifier rationale, LCD citation, etc.] 2. [Reference the paired CARC and the corresponding fix] 3. [Attach the supporting document listed in step 1] Attached: {list supporting documents} Please process this line under the member's benefits. Contact the billing office at {provider_phone} for questions. Sincerely, {billing_manager_name}, {credentials}

Edit the bracketed fields before sending. Payer-specific reconsideration forms are often required — check the provider portal first.

How common is RARC N109?

Platform frequency
Pending ETL

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

How QuickRCM handles RARC N109

QuickRCM reads RARC N109 alongside its paired CARC in the 835 LQ segment and routes the line to the correct worker queue with the right documentation already attached:

  • Denial routing rules tuned to the CARC+RARC pair — the paired combination tells QuickRCM which documentation the payer will accept.
  • Reconsideration template for this exact remark code pulls the supporting facts from the claim automatically.
  • Pre-submission scrubs that catch the preventable drivers surfaced on this page before the 837 leaves the clearinghouse.
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Frequently asked questions — RARC N109

What does RARC N109 mean?

RARC N109 is an X12 Remittance Advice Remark Code. The official X12 definition is: "This claim/service was chosen for complex review and was denied after reviewing the medical records." It is supplemental to a Claim Adjustment Reason Code (CARC) on the same 835 line.

Which CARC is paired with RARC N109?

RARC N109 is most commonly paired with CARC 50, CARC 125. The CARC is the financial adjustment reason; the RARC is the informational remark. Fix the paired CARC first — the RARC usually clears with the corrected claim.

How do I resolve a RARC N109 remark on a remit?

Start from the root cause: Complex review found insufficient clinical support. First step: Appeal with targeted clinical evidence addressing review findings. Because RARCs are supplemental, the resolution is almost always to address the paired CARC rather than appeal the RARC alone.

Where does RARC N109 appear on the 835 ERA?

RARC N109 is carried on the 835 Loop 2110 LQ segment alongside the CARC in the CAS segment of the same service line. The code and its X12 description also print on the paper EOB in the "Remark Code" or "Remark" column next to the corresponding denial or adjustment reason.

Is RARC N109 the same as ICD-10 code N109?

No. RARC N109 is a remittance-advice remark code published by X12 and carried on the 835. Any ICD-10 code with the same letters and digits is a diagnosis code on the 837 HI segment — a completely different code set maintained by the WHO/CMS. Use the transaction context (835 = RARC; 837 = ICD-10) to disambiguate.

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.