RARC (Remittance Advice Remark Code)
Remittance Advice Remark Code
X12-maintained codes that supplement the CARC with additional information about a claim adjustment.
1 min read · Last reviewed May 23, 2026
At a glance
- Category
- Denials & Appeals
- Acronym for
- Remittance Advice Remark Code
- Primary sources
- 2
- Workspace handoff
- denial workbench →
Where this comes up
This is denial-workbench territory. A remit posts with a CARC/RARC, the biller decides whether to rebill, appeal, or write off, and the appeal packet has to cite the chart, the order, and the payer's own policy language. Recurring patterns trace back to an upstream workflow gap.
Full definition
What it is in practice
RARCs provide the granular reason a CARC was applied. The full list is updated quarterly. RARCs of the M-series are CMS-defined; N-series are X12-defined.
How it shows up in your practice
Mapping CARC + RARC pairs to your appeal templates is the single highest-leverage denial-management workflow.
Sources
- CMS — Remittance Advice Remark Codeshttps://x12.org/codes/remittance-advice-remark-codes
- CMS — 835 Electronic Remittance Advicehttps://www.cms.gov/medicare/billing/electronic-billing-edi-transactions/electronic-billing-edi-transactions-process
Map RARC patterns in the Denial Workbench
Open denial workbench →Related terms
- Denials & AppealsCARC (Claim Adjustment Reason Code)X12-maintained codes communicating why a claim or service line was paid differently than billed.
- Denials & AppealsDenial ManagementThe end-to-end workflow of identifying, categorizing, appealing, and preventing claim denials.
- Denials & Appeals835 Electronic Remittance Advice (ERA)The HIPAA-mandated electronic transaction by which payers communicate payment and adjustment information to providers.
D3rx is a healthcare-billing and compliance research aid maintained by D3rx Inc. Articles are drafted by an LLM (Anthropic Claude) against primary HHS, OCR, CMS, eCFR, NIST, and state-regulator publications, and reviewed for restraint and source fidelity by the D3rx team.
Reviewer status: a named credentialed reviewer (CHC, CHPC, or healthcare attorney) is being engaged. Until that engagement is finalized, this page does not claim credentialed review.
Related across the archive
- Glossary835 Electronic Remittance Advice (ERA)The HIPAA-mandated electronic transaction by which payers communicate payment and adjustment information to providers.
- GlossaryCARC (Claim Adjustment Reason Code)X12-maintained codes communicating why a claim or service line was paid differently than billed.
- GlossaryDenial ManagementThe end-to-end workflow of identifying, categorizing, appealing, and preventing claim denials.
- GlossaryCO-16 (Claim Lacks Information)Contractual Obligation 16 — the claim or service line lacks information or has submission/billing errors.
- GlossaryCO (Contractual Obligation)An X12 adjustment group code indicating the patient is not responsible because the amount is a contractual write-off.
- GlossaryPR (Patient Responsibility)An X12 adjustment group code indicating the patient owes the amount (deductible, coinsurance, copay, or non-covered service).
- Glossary837 Electronic ClaimThe HIPAA-mandated electronic transaction for submitting professional (837P), institutional (837I), or dental (837D) claims.
- BillingHow to Appeal an Insurance Denial: Step-by-Step GuideClaim denied? Step-by-step appeal process with payer deadlines, denial code fixes, appeal letter template, and escalation options.
This glossary entry is a research aid for billing and compliance staff. It does not provide legal, medical, or financial advice and does not replace counsel. References cited link to primary sources at HHS, OCR, CMS, eCFR, NIST, and the relevant payer or industry body.