Cigna Claim Denials Resolution
Cigna Claim Denials Resolution: Overview
Cigna denials cluster around four CARC codes: CO-16 (not medically necessary), CO-45 (not covered), CO-50 (services not rendered as billed), and CO-197 (claim submitted within re-submission limit). Most are preventable through proper authorization, correct coding, and documentation. Appeal window: 180 days from denial (365 in California). Cigna responds within 60 days.
Key Requirements
- Prior Authorization: Retain all authorizations and approval letters. Submit with claims to prevent CO-45 denials.
- Accurate Coding: Use CPT/ICD-10 codes matching service delivered. Verify code combinations are supported.
- Clinical Justification: Include diagnosis, history, and necessity evidence in auth requests.
- Member Eligibility: Confirm coverage active on service date. Non-covered services result in CO-45 denials.
- Timely Filing: Submit claims within 90 days from DOS. Late claims are not appealable.
- Appeal Documentation: File within 180 days (365 in California) with denial letter and clinical records.
Timeline & Process
Denial Receipt: Cigna sends explanation of benefits with CARC code and reason. Review within 10 days.
Appeal Filing: Submit appeal within 180 days (365 in California) via portal, mail, or phone with denial details and corrected documentation.
Appeal Resolution: Cigna responds within 60 days. Denial triggers right to independent external review.
Common Denials
| CARC Code | Root Cause | Prevention Strategy |
|---|---|---|
| CO-16 | Not medically necessary | Include diagnosis, prior treatment history, clinical justification, and physician notes in authorization request. Reference evidence-based guidelines supporting necessity. |
| CO-45 | Not covered (no auth) | Obtain prior authorization before service. Verify coverage under member's plan. Document authorization number on claim. |
| CO-50 | Services not rendered as billed | Match billed CPT codes to actual service. Avoid unbundling. Use correct place of service, units, and modifiers matching delivery. |
| CO-197 | Claim submitted within re-submission limit | Wait for Cigna's response to original claim before resubmitting. Include correction notice when resubmitting denied claim with coding changes. |
Appeal Process
Gather original denial letter, authorization documents, clinical records, and written rebuttal. File via portal, mail, or phone within 180 days (365 in California). Cigna responds within 60 days. If denied, request independent external review.
Common Questions
What are the most common Cigna denial codes?
CO-16 (not medically necessary), CO-45 (not covered), CO-50 (services not rendered as billed), and CO-197 (claim for same/similar service submitted within time limit) are Cigna's most frequent denials. Review the denial reason statement for specific prevention steps.
How long do I have to appeal a Cigna denial?
Standard appeal window: 180 days from denial date. California in-network providers: 365 days from denial. File appeals within the window via portal, mail, or phone. Late appeals are not processed.
What documents support a successful appeal?
Include original denial letter, claim detail report, authorization approval (if applicable), clinical records, patient eligibility verification, and written explanation addressing each denial reason. Organize chronologically for clarity.
Altair checks Cigna requirements before submission . flagging missing authorizations and coding mismatches in real time. See how Altair works.
This reference is for informational purposes. Payer policies change frequently. Always verify against Cigna's current provider documentation. Last updated: 2026-03-16.
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