How Insurance Companies Review Claims — June 2026

If you've ever submitted what felt like a perfectly coded, completely documented claim only to get it kicked back with a vague denial reason, you're not alone. Understanding how insurers actually review claims — not just the surface-level stuff, but what's really happening behind the curtain — can dramatically change how your team submits, documents, and appeals. And as payers automate more of claim review, this knowledge matters more.

Automated Edits and Triage

Many claims are adjudicated automatically without a person ever looking at them. Payers run each claim through rule-based edits and, increasingly, predictive models.

When your claim hits a payer's system, it goes through a multi-layered scrubbing process almost immediately:

• Eligibility and coordination of benefits checks — Is the patient actually covered? Is there another payer that should go first?
• Code-level edits — Do the procedure codes make clinical sense together? Are there unbundling issues or modifier problems?
• Medical necessity flags: Does the diagnosis support the procedure under the payer's medical policy (for Medicare, the applicable NCD or LCD)?
• Utilization pattern analysis — Does this provider's billing pattern look unusual compared to peers?

That last one matters. Payers compare a provider's billing patterns with those of peers, and a sudden spike in one code, even a legitimate one, can draw closer review. It does not mean you will be denied.

Practical tip: Run your own internal edits before claims go out. Most practice management systems have claim scrubbers built in, but they're only as good as your payer-specific rule libraries. Make sure those are updated quarterly.

What Happens When a Claim Triggers Manual Review

Not everything gets auto-adjudicated. High-dollar claims, certain procedure types (think complex surgical cases, durable medical equipment, or anything requiring prior auth), and providers flagged for pattern review will often land in a queue for human eyes.

This is where utilization management (UM) reviewers come in. Nurses and other clinically trained staff often do the first review, working from the payer's coverage guidelines, which may be licensed criteria sets or the payer's own published policies. In some programs a clinician must review a medical necessity denial before it is issued: for example, Medicare Advantage plans must have a physician or other appropriate health care professional review any expected adverse medical necessity decision (42 CFR 422.566(d)). Here's what reviewers are looking at:

Documentation completeness. Is the medical necessity clearly stated? "Patient has back pain" doesn't cut it for an MRI anymore. Reviewers want to see failed conservative treatment, specific functional limitations, duration of symptoms, and the clinical rationale for why imaging is needed now.

Prior authorization compliance. If auth was required and wasn't obtained, that claim is almost certainly going to denial regardless of medical necessity. This is a process failure, not a clinical one, and it is preventable.

Coding and documentation alignment. The diagnosis codes need to tell a coherent story that matches your notes. A common red flag: providers who document a visit thoroughly but then select codes that don't reflect the acuity they described. That mismatch creates suspicion.

For example, appropriate, well-documented stress echocardiograms can still be denied when the ordering diagnosis codes don't match the payer's preferred sequencing. Fixing how the EHR auto-populates the primary diagnosis code addresses the root cause.

The Appeals Process: Where Most Practices Leave Money Behind

Denials that are never worked are revenue the practice does not collect. The ones worth appealing are those where the record supports the service and the denial reason can be answered directly.

The reason most practices don't appeal more aggressively is bandwidth. Writing a solid appeal letter takes time, requires clinical language, and needs to reference the payer's specific coverage criteria. That's a lot to ask of an already stretched billing team.

A few things that actually move the needle on appeals:

• Always request the specific denial reason in writing, including the clinical rationale and the policy or guideline the payer cited. You're entitled to this.
• Match your appeal language to their language. If their denial cites a specific LCD criterion, your appeal should address that criterion directly — almost verbatim.
• Include peer-reviewed literature when appropriate. For complex clinical denials, attaching one or two supporting studies shows you're taking the appeal seriously and makes it harder for reviewers to rubber-stamp a denial.
• Know your deadlines. Traditional Medicare redeterminations are due within 120 days of receiving the initial determination; Medicare Advantage reconsiderations within 65 days of the notice; members of ACA-compliant commercial and ERISA group plans have at least 180 days for an internal appeal; provider appeals under a participation contract follow the contract (commonly 60 to 180 days, sometimes 365); Medicaid windows vary by state and plan. Check the contract and the denial notice. Missing a deadline is an unforced error.

On the tools side — there are now AI-powered appeal generators that can draft clinically appropriate, payer-specific appeal letters in minutes based on the denial code and clinical context. If your team is drowning in denials, it's worth evaluating those options seriously.

The 2026 Landscape: What's Changed and What's Still Broken

A few developments worth knowing about as we move through 2026:

Rules on payer AI are specific, not general. For Medicare Advantage, CMS told plans in a February 6, 2024 FAQ that an algorithm or software tool may assist with coverage decisions, but a medical necessity decision must be based on the individual patient's circumstances, not on a larger data set. California's SB 1120, in effect since January 1, 2025, requires that medical necessity determinations by health plans and health insurers be made only by a licensed physician or other competent licensed health care professional, and that AI tools not supplant provider decision-making. When a denial reads like a template, ask for the clinical rationale and the criteria applied, and argue from the patient's own record.

Gold-carding is expanding. More states have enacted gold-carding laws that exempt high-performing providers from prior authorization requirements for certain procedures. If your state has this law and you qualify, make sure you're actually using it. Many practices aren't.

Preventive care coding is still a mess. The ongoing confusion around preventive vs. diagnostic visit billing — particularly for Medicare Advantage plans — continues to generate unnecessary denials. Make sure your front desk is educating patients on what to expect at the time of scheduling, and that your coders understand how each MA plan handles this differently.

Making This Work for Your Practice

Understanding payer review processes isn't just an academic exercise — it directly affects your collections, your staff workload, and honestly, your sanity. Here's where to start:

1. Pull your denial report by denial code this week. What are your top five denial reasons? That tells you where the leak is.
2. Audit five to ten recently denied claims in detail. Are the denials legitimate? Are they documentation issues, coding issues, or process failures?
3. Set a policy for mandatory appeal on any denial above a certain dollar threshold, calibrated to your practice size.
4. Talk to your payer reps. They exist for a reason. A good provider relations contact can clarify coverage policies before you submit, not after.

Claims management isn't glamorous work. But practices that treat it strategically — rather than reactively — consistently outperform their peers on clean claim rates and collections. The insurers have invested heavily in technology to protect their bottom line. It only makes sense to invest equally in understanding how that technology works.