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RARC N329 · Remittance Advice Remark Code

RARC N329 Remark Code: Missing/incomplete/invalid patient birth date

Reviewed by QuickIntell RCM Editorial Team · Last reviewed

Updated

Not an ICD-10 code. RARC N329 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 N329 (X12 Missing/incomplete/invalid patient birth date). Commonly paired with CARC 14, CARC 16. RARC N329 flags missing/invalid DOB on the claim.

Official X12 description

“Missing/incomplete/invalid patient birth date.”

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 N329 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 14The date of birth follows the date of service.
CARC 16Claim/service lacks information or has submission/billing error(s).
CARC 140Patient/Insured health identification number and name do not match.

What RARC N329 actually means

RARC N329 flags missing/invalid DOB on the claim. Correct and rebill.

Common root causes

  • DOB blank, invalid format, or mismatch with payer's file.

Prevention checklist

  • DOB validation via 270/271 at registration.

Resolution & appeal strategy — step by step

Because RARC N329 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. 1Correct and rebill.
Sample reconsideration language referencing RARC N329
[Provider letterhead] Re: Reconsideration — Claim #{claim_number}, CARC 14 / RARC N329 Member: {member_name} · Member ID: {member_id} Date(s) of Service: {dos} The 835 remittance on {remittance_date} carried RARC N329: "Missing/incomplete/invalid patient birth date." 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 N329?

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 N329

QuickRCM reads RARC N329 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 N329

What does RARC N329 mean?

RARC N329 is an X12 Remittance Advice Remark Code. The official X12 definition is: "Missing/incomplete/invalid patient birth date." It is supplemental to a Claim Adjustment Reason Code (CARC) on the same 835 line.

Which CARC is paired with RARC N329?

RARC N329 is most commonly paired with CARC 14, CARC 16, CARC 140. 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 N329 remark on a remit?

Start from the root cause: DOB blank, invalid format, or mismatch with payer's file. First step: Correct and rebill. Because RARCs are supplemental, the resolution is almost always to address the paired CARC rather than appeal the RARC alone.

Where does RARC N329 appear on the 835 ERA?

RARC N329 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 N329 the same as ICD-10 code N329?

No. RARC N329 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.