Key Statistics
Initial claim denial rate (2024)
Up from ~10% a few years earlier
Of denials overturned on appeal
But fewer than 1% are ever appealed
Lost to claim denials in 2024
Across the US healthcare system
Denial Rates: 5-Year Trend
Claim denial rates have risen steadily over the past five years. Insurance companies are using AI and automated systems to identify "suspicious" claims, leading to more mass-denials. Simultaneously, many practices have reduced their denial management teams, creating a gap where denials pile up unaddressed.
For a practice with $1 million in annual revenue, a 1% denial rate change represents $10,000 in lost revenue. At 11.3%, your practice is losing approximately $113,000 annually to claim denials—much of it recoverable through appeals.
Top Denial Codes in 2024-2025
These denial codes account for the majority of denials. Understanding which ones affect your practice helps you focus your prevention efforts.
CO-233: Service Denied – Criteria Not Met
Medical necessity denial. The payer claims the patient doesn't meet clinical criteria for the service.
Common causes: Insufficient documentation, diagnosis doesn't match service, payer's clinical criteria stricter than guidelines.
CO-96: Non-Covered Service
The payer says the service or diagnosis combination isn't covered under this plan.
Common causes: Diagnosis exclusion, procedure not covered for this condition, patient coverage lapsed or excluded.
CO-16: Missing Information
Claims adjudication cannot proceed without additional information.
Common causes: Missing diagnosis code, incomplete clinical notes, missing modifier, lack of treatment history.
These denials are 100% preventable with proper claim scrubbing.
CO-119: Benefit Maximum Reached
Patient has exhausted their annual benefit.
Common causes: Benefit information not verified before service, patient had other claims this year.
CO-72: Duplicate Claim
Payer has already received and paid this claim.
Common causes: Accidental resubmission, claim system glitch, payer claim matching error.
Denial Rates by Payer
Some payers have higher denial rates than others. These figures represent 2024-2025 data from practices reporting to denial management systems.
UnitedHealthcare
14.2%Highest denial volume among commercial payers
Cigna
12.8%Aggressive medical necessity criteria
Aetna
11.5%High appeal success rate on reconsideration
Blue Cross/Blue Shield
10.1%Varies by state plan
Humana
9.7%Below-average denial rate
Medicare
8.2%Lowest denial rate; high appeal success
Denial Rates by Specialty
Denial rates vary by clinical specialty. Specialties with more complex coding or higher payer scrutiny see higher denial rates.
Cardiology
Complex coding, high imaging utilization
Orthopedics
Surgical procedures heavily scrutinized
Psychiatry
Medical necessity frequently questioned
Primary Care
Lower complexity, fewer denials
Family Medicine
Straightforward coding, lower denial rates
What This Means for Your Practice
Key Takeaways
- Denials are increasing. If you're not actively managing claims, you're losing more money every year.
- Prevention is cheaper than appeals. CO-16 (missing information) denials are 100% preventable with pre-submission scrubbing.
- Appeals work. Over half of denied claims are overturned when appealed. If your practice isn't appealing, you're leaving significant revenue on the table.
- Know your payers. UnitedHealthcare and Cigna have significantly higher denial rates. Customize your documentation and appeals for these payers.
Where Should You Focus?
You don't need to overhaul your entire billing operation. Start here:
Track your denial codes
For one month, log every denial code you receive. Which codes are costing you the most?
Implement pre-submission scrubbing
If you're getting a lot of CO-16 denials, review your claim submission process. Missing information is preventable.
Start appealing systematically
Don't leave money on the table. Appeal every claim that meets your criteria. AI tools like RediClaim make this fast.
Stop Losing Revenue to Denials
At 11.3% denial rates, practices are bleeding money. RediClaim helps you fight back with:
- AI-generated appeal letters in 60 seconds
- Pre-submission claim scrubbing to prevent denials
- HIPAA-compliant, de-identified processing
Related Guides
How to Appeal a Denied Claim
Step-by-step guide to filing effective appeals that actually get approved.
Claim Scrubbing Best Practices
Catch denial triggers before submission and prevent CO-16 denials entirely.
RCM for Small Practices
Build a sustainable denial prevention and revenue recovery operation.