RARC — Remittance Advice Remark Codes (N and M codes)

Remittance Advice Remark Codes (RARC)#

Remittance Advice Remark Codes (RARC) are a HIPAA-standard public code set, maintained by X12 and published by the Washington Publishing Company (WPC), used to convey *additional explanatory detail* on a remittance advice (the 835 ERA) or paper EOB. A RARC supplements a Claim Adjustment Reason Code (CARC); it rarely stands alone.

Two kinds of RARC:

• Supplemental RARCs further explain an adjustment already described by a CARC. These usually begin with N (e.g., N130, N290).
• Informational RARCs start with Alert: and pass along information that does not directly change the payment.
• Older codes begin with M (e.g., M51, M15); these are still in active use.

Why RARCs matter for denial resolution: A CARC tells you the *category* (e.g., CARC 16 = missing info). The RARC tells you the *specific actionable element*. You cannot work a CARC 16 denial without its RARC, because only the RARC says *what* is missing.

Frequently seen RARCs:

• N130 — Consult plan benefit documents/guidelines for information about restrictions for this service.
• N290 — Missing/incomplete/invalid rendering provider primary identifier.
• N257 — Missing/incomplete/invalid billing provider/supplier primary identifier.
• M51 — Missing/incomplete/invalid procedure code(s).
• M15 — Separately billed services/tests have been bundled as they are considered components of the same procedure.
• N115 — This decision was based on a Local Coverage Determination (LCD).
• MA130 — Your claim contains incomplete and/or invalid information; no appeal rights are afforded because the claim is unprocessable.

A practical denial-management workflow always parses the CARC + Group Code + RARC together, then routes the claim to "correct and resubmit" versus "formal appeal" based on that combination.