CARC 51 Active

PR-51: Non-Covered Pre-existing Condition

TL;DR

Patient responsibility — review the denial and appeal if the patient should not be liable. Do not bill the patient until the appeal is resolved.

Action
Appeal
Who Pays
Patient
Appeal
Yes
Patient Impact
Direct Financial
Disclaimer
This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does PR-51 Mean?

With PR (Patient Responsibility), the CARC 51 adjustment for non-covered pre-existing condition shifts the financial impact to the patient. Before billing the patient, verify that the denial reason is valid. The most common cause is services for pre-existing conditions shifted to patient responsibility — if the underlying issue can be corrected, resubmit the claim first to potentially eliminate the patient's liability.

CARC 51 indicates non-covered pre-existing condition. The payer determined that the service or a portion of it does not meet coverage criteria under the patient's current plan benefits or the applicable coverage rules.

Common scenarios that trigger this adjustment include: the plan has a pre-existing condition exclusion clause (typically grandfathered or non-ACA-compliant plans); Short-term health plans are not subject to ACA pre-existing condition protections; The plan has a waiting period before pre-existing conditions are covered. The group code paired with CARC 51 determines who bears the financial responsibility — CO places it on the provider as a contractual obligation, PR shifts it to the patient, OA indicates a coordination of benefits or other payer adjustment.

Common Causes

Cause Frequency
Patient responsible for pre-existing condition treatment Services for pre-existing conditions shifted to patient responsibility Most Common

How to Resolve

  1. Review the denial Examine the PR-51 denial and any RARC codes to understand why the patient was held responsible.
  2. Gather supporting documentation Collect medical records, authorization documents, or plan benefit details that support coverage.
  3. File an appeal Appeal on the patient's behalf under ACA protections. If the plan is non-ACA-compliant and the exclusion is valid, the patient is responsible.
  4. Hold patient billing pending appeal Do not bill the patient until the appeal is resolved. If the appeal is denied, then generate a patient statement.
Appeal Guide

Appeal on the patient's behalf under ACA protections. If the plan is non-ACA-compliant and the exclusion is valid, the patient is responsible.

Common RARC Pairings

The RARC code tells you exactly what triggered the PR-51:

RARC Description
N381 Consult contract/fee schedule Review pre-existing condition terms before billing patient →

How to Prevent PR-51

Also Filed As

The same CARC 51 may appear with different Group Codes:

CO-51 OA-51

Related Denial Codes

PR-26 — Expenses Incurred Prior to Coverage PR-35 — Lifetime Benefit Maximum Reached PR-40 — Charges Do Not Meet Emergent/Urgent Care Qualifications PR-49 — Non-Covered Routine/Preventive Exam PR-55 — Procedure/Treatment Deemed Experimental/Investigational

Sources

  1. https://x12.org/codes/claim-adjustment-reason-codes
  2. https://revenuecyclemgmt.com/claim-adjustment-reason-codes/
  3. https://www.rivethealth.com/blog/carcs-rarcs-claim-adjustment-remittance-advice-codes
  4. Codes maintained by X12. Visit x12.org for official definitions.