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RARC N10 · Remittance Advice Remark Code

RARC N10 Remark Code: Adjustment based on a medical/dental provider's initial determination

QuickIntell editorial content · Legacy registry date · Review not verified

Updated

Not an ICD-10 code. RARC N10 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 N10 (X12 Adjustment based on a medical/dental provider's initial determination). Commonly paired with CARC 45. RARC N10 reflects a prior provider determination (often dental or optical) feeding into this claim's adjudication.

Denial-resolution specialist and clinician reviewing a claim together

Official X12 description

“Adjustment based on a medical/dental provider's initial determination.”

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 N10 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 45Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.

CARCs CAQH CORE pairs with RARC N10

Under the CAQH CORE Payment and Remittance Uniform Use rule, a health plan that reports remark code N10 on an 835 should pair it with one of the 20 claim adjustment reason codes below, with the listed group code, for the business scenario 3 (Billed service not covered by the health plan). A remark paired outside this list is itself a compliance question to raise with the payer.

CORE-required CARC and group code combinations that include RARC N10
CARCGroup codeScenario
40CO, PI or PR3: Billed service not covered by the health plan
50CO, PI or PR3: Billed service not covered by the health plan
51CO, PI or PR3: Billed service not covered by the health plan
54CO, PI or PR3: Billed service not covered by the health plan
55CO, PI or PR3: Billed service not covered by the health plan
59CO, PI or PR3: Billed service not covered by the health plan
96CO, PI or PR3: Billed service not covered by the health plan
108CO, PI or PR3: Billed service not covered by the health plan
150CO, PI or PR3: Billed service not covered by the health plan
151CO, PI or PR3: Billed service not covered by the health plan
169CO, PI or PR3: Billed service not covered by the health plan
177CO, PI or PR3: Billed service not covered by the health plan
198CO, PI or PR3: Billed service not covered by the health plan
204CO, PI or PR3: Billed service not covered by the health plan
269CO, PI or PR3: Billed service not covered by the health plan
272CO, PI or PR3: Billed service not covered by the health plan
273CO, PI or PR3: Billed service not covered by the health plan
B13CO, PI or PR3: Billed service not covered by the health plan
B20CO, PI or PR3: Billed service not covered by the health plan
P21CO, PI or PR3: Billed service not covered by the health plan
Source: CAQH CORE-required Code Combinations v3.10.0 (2026-02), published by CAQH CORE (operating rules).

What RARC N10 actually means

RARC N10 reflects a prior provider determination (often dental or optical) feeding into this claim's adjudication. Usually informational.

Common root causes

  • Prior provider's determination applied.

Prevention checklist

  • Coordination across dental/medical workflows.

Resolution & appeal strategy — step by step

Because RARC N10 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. 1Not typically appealable.
Sample reconsideration language referencing RARC N10
[Provider letterhead] Re: Reconsideration — Claim #{claim_number}, CARC 45 / RARC N10 Member: {member_name} · Member ID: {member_id} Date(s) of Service: {dos} The 835 remittance on {remittance_date} carried RARC N10: "Adjustment based on a medical/dental provider's initial determination." 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 N10?

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 N10

QuickRCM reads RARC N10 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.
Prevent denials before submission →Manage RARC-driven denialsBook a demo

Frequently asked questions — RARC N10

What does RARC N10 mean?

RARC N10 is an X12 Remittance Advice Remark Code. The official X12 definition is: "Adjustment based on a medical/dental provider's initial determination." It is supplemental to a Claim Adjustment Reason Code (CARC) on the same 835 line.

Which CARC is paired with RARC N10?

RARC N10 is most commonly paired with CARC 45. 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 N10 remark on a remit?

Start from the root cause: Prior provider's determination applied. First step: Not typically appealable. Because RARCs are supplemental, the resolution is almost always to address the paired CARC rather than appeal the RARC alone.

Where does RARC N10 appear on the 835 ERA?

RARC N10 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 N10 the same as ICD-10 code N10?

No. RARC N10 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.