What Are Insurance Appeal Success Rates?
Most people never appeal insurance denials, but those who do have surprisingly good odds. Understanding real success rates can motivate you to fight back.
Internal Appeal Success Rates
Internal appeals — reviewed by your insurer — succeed approximately 40-50% of the time across all claim types. Some categories have higher success rates:
- Prior authorization appeals: 40-60% success
- Medical necessity appeals: 30-50% success
- Coding/billing appeals: 60-80% success (often simple corrections)
- Out-of-network appeals: 20-40% success
External Review Success Rates
External reviews — conducted by independent reviewers — have even higher success rates:
- Overall: 40-60% of external reviews favor the patient
- Some states report: Up to 72% patient success rate
- Cancer/specialty treatments: Higher success rates than average
Why Most People Don't Appeal
Despite good odds, fewer than 1 in 500 denied claims are appealed. Reasons include:
- People don't know they can appeal
- The process seems intimidating
- Deadline passes before they act
- Belief that the decision is final
How to Improve Your Odds
- Address the specific denial reason — generic appeals have lower success
- Include clinical guidelines — evidence-based support dramatically improves outcomes
- Get your doctor involved — physician-supported appeals win more often
- Submit on time — late appeals often cannot be considered
- Escalate to external review — independent reviewers are often more favorable