Humana vs. Cigna: Comparing Denial Rates by Insurer (2026)" class="auto-link">Denial Rates and Appeal Success

Humana and Cigna each cover millions of Americans across employer plans, Medicare Advantage, and individual markets. But their approaches to claim denials differ in meaningful ways. Understanding those differences can help you anticipate problems, build a stronger appeal, and know your rights before the fight begins.

Humana's Denial Profile

Humana is one of the dominant players in Medicare Advantage, and its denial patterns in that market have drawn congressional scrutiny. A 2022 report from the Department of Health and Human Services Office of Inspector General found that Humana denied Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization requests for post-acute care at rates significantly higher than original Medicare would have covered, and that many of those denials were later overturned on appeal.

In the individual and employer markets, Humana has expanded its prior authorization requirements substantially over the past several years. Behavioral health claims, specialty pharmacy, and high-cost imaging (MRI, PET scans) are frequent denial targets. Humana uses Milliman Care Guidelines for many utilization management decisions — a set of clinical criteria that critics argue are more restrictive than clinical practice guidelines from medical specialty societies.

Common Humana denial reasons include:

• Prior authorization not obtained
• Service not medically necessary per Humana's clinical criteria
• Out-of-network provider (increasingly common as Humana narrows networks)
• Experimental or investigational treatment

Cigna's Denial Profile

Cigna attracted national attention in 2023 when a ProPublica investigation revealed that Cigna medical reviewers were denying claims in bulk — sometimes reviewing and rejecting hundreds of cases per day — without individually reviewing patient records. The company denied the characterization, but the investigation triggered multiple state investigations and a $172 million multi-state settlement in 2024.

Cigna's denial patterns tend to concentrate in:

• Mental health and substance use disorder claims (Cigna has faced parity law violations in several states)
• Specialty medications, particularly biologics and gene therapies
• Out-of-network emergency care
• Durable medical equipment (DME)

Cigna uses its own proprietary clinical review criteria, which are less publicly transparent than some competitors. This makes appealing Cigna denials somewhat more challenging because it can be harder to directly rebut the specific standard applied.

Denial Rate Comparison

Publicly available ACA marketplace data shows Cigna with higher-than-average denial rates in several states where it operates exchange plans. Humana's marketplace presence is smaller, but its Medicare Advantage denial rates have been a focal point of regulatory concern.

For employer plans (governed by ERISA), neither insurer is required to report denial rates publicly, which limits direct comparisons. However, NAIC complaint data gives some insight: Cigna consistently draws more consumer complaints related to claim handling than Humana, though both rank above national median complaint ratios.

Appeal Success: Humana vs. Cigna

Humana appeals: Humana's internal appeal process is often slow, particularly for Medicare Advantage denials. Federal rules require Medicare Advantage insurers to respond to standard appeals within 60 days — but urgent care appeals must be decided within 72 hours. Humana's external appeal (Independent Medical Review) overturn rate is significant, meaning pushing past the internal process often pays off.

Cigna appeals: Cigna's internal appeals show moderate overturn rates for medical necessity denials when strong physician documentation is provided. Mental health parity appeals are particularly effective against Cigna — courts and state regulators have repeatedly found that Cigna's behavioral health criteria are more restrictive than its medical/surgical criteria, which is illegal under the Mental Health Parity and Addiction Equity Act.

If you've been denied by Cigna for a mental health or substance use disorder claim, citing the parity law in your appeal significantly increases your odds of success.

Practical Comparison: Which Is Harder to Appeal?

Both insurers are substantial bureaucracies, but there are real differences:

• Cigna is more likely to deny based on internal criteria that aren't clearly published, making it harder to know exactly what standard you need to meet. However, the parity law provides a powerful additional argument for behavioral health denials.
• Humana (especially in Medicare Advantage) has a more rigid administrative process, but federal oversight means there are stronger procedural protections, including mandatory timelines and access to the ALJ appeals process if internal review fails.

For both insurers, the single most important factor in appeal success is physician involvement. Having your treating doctor submit a peer-to-peer review or write a detailed supporting letter dramatically improves outcomes, regardless of which insurer you're fighting.

Fight Back With ClaimBack

ClaimBack gives you the tools to challenge Humana, Cigna, and any other insurer that has wrongly denied your claim. Don't let a denial letter be the last word — start your appeal today at https://claimback.app/appeal.

Related Reading

• What Is Medical Necessity?
• Internal vs. External Insurance Appeals
• Common Reasons Insurance Claims Are Denied