❓ Frequently Asked Questions
Common questions about medical denial codes and billing
General Questions
What is the difference between CARC and RARC codes?
CARC (Claim Adjustment Reason Codes) explain WHY a claim was adjusted or denied, while RARC (Remittance Advice Remark Codes) provide additional information or context about the adjustment. CARCs are required on all remittance advice; RARCs are supplemental.
Where do I find these codes on my EOB?
Denial codes appear in the "Reason Code" or "Remark Code" columns of your Explanation of Benefits (EOB) or Electronic Remittance Advice (ERA). CARCs are typically 1-3 digit numbers, while RARCs are alphanumeric (like N130 or M15).
Are these codes the same for all insurance companies?
Yes! CARC and RARC codes are standardized across all payers as required by HIPAA. However, individual payers may have their own internal codes or proprietary reason codes for specific situations.
Appeals & Resolution
How do I know if a denial is appealable?
Check the code detail page on this site - we indicate whether each code is typically appealable. Generally, denials for medical necessity, authorization issues, or coding errors are appealable, while patient responsibility codes (deductibles, copays) are not.
What is the time limit for filing an appeal?
Appeal timeframes vary by payer but typically range from 30-180 days from the date of the initial denial. Always check your contract or the EOB for specific deadlines. Medicare appeals must be filed within 120 days.
What documentation do I need for an appeal?
Common requirements include: medical records, clinical notes, lab results, prior authorization documentation, coding rationale, and a written appeal letter. Check the specific code page for detailed evidence checklists.
Prevention & Best Practices
How can I prevent denials before they happen?
Key prevention strategies: verify eligibility before service, obtain required authorizations, code accurately and specifically, document medical necessity thoroughly, and submit claims within filing limits.
Should I resubmit or appeal a denied claim?
If the denial is due to a correctable error (wrong code, missing info), resubmit a corrected claim. If the payer made an error or you disagree with their decision, file a formal appeal with supporting documentation.
How often are denial codes updated?
The official CARC/RARC code lists are updated quarterly by the Washington Publishing Company. New codes are added as needed, and existing codes may be modified or retired. This site is updated regularly to reflect current codes.
Technical Questions
What does it mean when multiple codes appear together?
Multiple codes provide layered information. A CARC explains the primary reason for adjustment, while accompanying RARCs add context or specify required actions. For example, CARC 16 (incomplete info) might appear with RARC N130 (consult plan documentation).
Why did I receive a different code from what I expected?
Payers may use different codes for similar situations based on their specific contract language, state regulations, or internal policies. The underlying issue may be the same even if the code differs from what you anticipated.
Can I use this site to learn about a specific denial pattern?
Absolutely! Use the search and browse features to research codes you see frequently. Understanding common denial patterns can help you improve front-end processes and reduce overall denial rates.
Using This Site
Is this information official?
We source all code definitions from official X12 standards and CMS guidelines. However, this site is for educational purposes only. Always verify with your specific payer and consult qualified billing professionals.
How do I search for a specific code?
Use the search bar in the header, or browse by category on the CARC or RARC listing pages. You can also navigate directly to a code by entering the URL: /carc/[code] or /rarc/[code].
Can I print or save these guides?
Yes! Each code detail page includes a "Print Guide" button in the sidebar. You can also bookmark pages or copy the URL to share with your team.
Still Have Questions?
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