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Quick Answer: Where Are Claims Getting Stuck in 2026?
Most claims don't stall at the payer — they stall before they ever leave the practice. Eligibility gaps, incomplete authorizations, and documentation that doesn't match the coded service are still the biggest drivers of downstream denials.
On the payer side, medical necessity reviews, bundling edits, and documentation requests remain common friction points, and CMS's 2026 prior authorization requirements are starting to change how fast decisions come back.
A meaningful share of lost revenue never shows up as a denial at all — it sits in underpayments, aging A/R, and follow-up requests nobody closed the loop on.
Ask most practices where denials come from and you'll get a payer-shaped answer: "the insurance companies." Ask a billing team working the queues daily, and the answer looks different. Claims stall at specific, predictable points — most of them well before a payer makes a coverage decision.
This isn't another list of reasons denials are expensive. It's a map of where claims actually break down across the revenue cycle, what's driving each bottleneck in 2026, and what practices can realistically do about it.
Where claims stall, stage by stage
Before the claim is even submitted
Front-end problems rarely look urgent in the moment. A missed eligibility check, a pending authorization, a referral not on file — none of that stops a visit from happening. It just moves downstream, resurfacing weeks later as a denial with a much smaller chance of a clean fix.
- Eligibility not verified close enough to the date of service
- Authorization requested but not yet approved when the claim goes out
- Referral requirements missed for plans that still enforce them
- Patient demographic or insurance ID errors carried from intake
- Documentation that doesn't yet support the billed level of service
Once a claim leaves with one of these gaps, the team is no longer preventing a denial — they're appealing one. That's a more expensive position to work from.
At claim creation
This is where clinical documentation becomes billable data, and small mismatches tend to surface as denials weeks later. Coding accuracy, modifier usage, and diagnosis-to-procedure alignment all get checked by the payer's system before a human looks at the claim.
- Diagnosis and procedure codes that don't clearly support each other
- Modifiers applied inconsistently or omitted where a payer expects one
- Place-of-service or provider info that doesn't match enrollment records
- Documentation supporting a different level of service than billed
None of this requires an actual coding error to trigger a denial — just a gap between what the note says and what the claim says.
During payer adjudication
Once a clean claim reaches the payer, it still clears several automated and manual checkpoints — medical necessity review, coverage policy edits, bundling logic, duplicate-claim checks, and payer-specific documentation requests. These rules aren't standardized. What clears one payer's system without a second look can trigger a records request at another.
This is where the 2026 shift in prior authorization matters. Under CMS's Interoperability and Prior Authorization Final Rule (CMS-0057-F), Medicare Advantage, Medicaid managed care, CHIP, and ACA marketplace plans must now issue standard prior authorization decisions within seven calendar days and expedited decisions within 72 hours, with a specific reason when a request is denied. Practices working with these plan types may see faster, more clearly documented authorization decisions through 2026, though the rule's API requirements for real-time electronic submission aren't required until January 2027.
After a claim is denied — the part most practices rush
A denial is a data point, not a dead end. Practices that recover the most revenue treat it as the start of a short, structured process rather than a reason to simply refile.
Denial → Review → Root Cause → Corrective Action → Appeal / Resubmission → Follow-Up → Resolution
Resubmitting the same claim with the same information and hoping for a different outcome isn't a strategy — it's a delay. Without a root cause, the same issue tends to resurface on the next claim, quietly eating into revenue and staff time.
Where revenue gets stuck without looking like a denial
A practice can show a perfectly reasonable denial rate on a monthly report and still be losing real money. That happens when revenue stalls in places that never generate a denial code at all.
- Underpayments — a claim pays, but below the contracted rate
- Unworked A/R — claims sitting in a queue with no follow-up action
- Takebacks and recoupments — payment clawed back after post-payment review
- Requests for additional information that were never answered
- Slow payer follow-up that quietly ages a claim past a filing deadline
Not every unpaid balance is an underpayment, and not every slow payment is a red flag — some delay is normal. Underpayments and unworked A/R require a different response than a formal denial, and lumping them together tends to mean neither gets addressed well.
The 2026 denial bottleneck map
A condensed view of where friction shows up across the revenue cycle, and where practices generally have the most leverage to fix it.
| Revenue Cycle Stage | Where It Stalls | Common Cause | What Practices Can Do |
|---|---|---|---|
| Registration / Eligibility | Coverage not verified near date of service | Eligibility checked too early or not re-checked | Verify eligibility close to the visit date |
| Authorization | Auth pending or missing at time of billing | Requirements not confirmed before scheduling | Confirm auth status before the claim is created |
| Coding | Diagnosis/procedure mismatch | Documentation gap or modifier omission | Review coding against documentation pre-submission |
| Claim Submission | Rejected at clearinghouse or payer edit | Missing or inconsistent claim data | Run claims through a validation/scrub step |
| Payer Adjudication | Medical necessity or bundling review | Payer-specific policy not accounted for | Track payer-specific requirements by plan type |
| Denial Follow-Up | Denial sits unworked | No root-cause categorization in place | Categorize denials before deciding next action |
| A/R | Claim ages without status update | No consistent follow-up cadence | Set aging thresholds that trigger review |
| Payment / Underpayment Review | Payment posts below expected rate | Contract terms not checked against payment | Compare postings against fee schedules regularly |
Denial or revenue leak? Four quick scenarios
These are the kinds of judgment calls billing teams make constantly.
A claim comes back from the payer with a denial code and explanation of benefits.
This is a formal denial. It needs root-cause review before resubmission or appeal.
A claim is paid, but the amount is lower than the contracted rate for that service.
Not a denial. Requires a payment-accuracy review against the payer contract.
A claim has been sitting with the payer for weeks with no status update or payment.
Not a denial yet. Needs an active follow-up call or portal check, not a resubmission.
Authorization was never obtained before the service was rendered.
A process gap, not a payer decision. Best fixed by tightening the pre-service workflow.
Case Snapshot: A Realistic Scenario
What happened: A multi-provider practice submitted claims on schedule, but claims for one payer kept returning as "authorization not on file," even though staff believed the authorization had been requested.
Where it got stuck: The request was submitted correctly, but confirmation numbers weren't logged against the patient's chart before the claim was created — so the claim went out without proof of authorization attached.
Root cause: A disconnect between the team requesting authorizations and the team submitting claims, with no shared checkpoint confirming approval before billing.
Better workflow: A pre-submission checkpoint confirming and logging authorization status — closing the gap between two teams each doing their job correctly, just out of sync.
What's actually changing in 2026
CMS-0057-F is now in effect
The decision-timeframe and denial-reason requirements are now in effect for impacted Medicare Advantage, Medicaid managed care, CHIP, and marketplace plans — fewer authorizations in limbo, and clearer reasons when one is denied.
Automation handling more repetitive work
Claim validation, denial categorization, and eligibility checks increasingly run through rules-based and AI-assisted tools before a claim reaches a person. That doesn't replace judgment — it changes where judgment gets applied.
Root-cause tracking over denial-volume tracking
More practices are moving from counting denials toward categorizing why they happen — the only way to reduce a recurring pattern instead of re-treating the same symptom.
Underpayment and revenue-leakage review gaining attention
As denial rates get more visibility, underpayments and unworked A/R draw more scrutiny too, since they can hide meaningful revenue even when denial numbers look fine.
Expert Insight: Automation suits claim validation, work-queue prioritization, and pattern recognition. Complex payer disputes, appeal writing, and coding judgment still depend on experienced staff — that isn't expected to change in 2026.
Recognize any of these patterns in your own claims?
We'll help you find where yours are actually getting stuck.
2026 denial management checklist
- Verify eligibility close to the date of service
- Confirm authorization requirements before the visit
- Validate claim data before submission
- Review coding and documentation alignment
- Monitor payer responses and turnaround times
- Categorize denials by root cause, not just volume
- Track appeal and resubmission outcomes
- Monitor aging A/R on a set cadence
- Review payment accuracy against contracted rates
- Watch for recurring denial patterns by payer
Five warning signs the denial process needs attention:
- The same denial reason keeps appearing across payers or providers
- Denials are resubmitted without documenting why they happened
- A/R aging past 90 days is climbing with no clear follow-up owner
- Payment postings aren't checked against contracted fee schedules
- No one on the team can state the practice's current denial rate
Common denial management mistakes
| Mistake | Why It Happens | Better Approach |
|---|---|---|
| Treating every denial the same | Bulk processing is faster than individual review | Sort denials by root cause first |
| Resubmitting without root-cause review | Speed prioritized over accuracy | Confirm what changed before refiling |
| Focusing only on denial volume | It's the easiest number to report | Track resolution rate and time-to-resolution too |
| Ignoring underpayments | No denial code, so easy to miss | Audit payments against contracted rates |
| Letting A/R age before follow-up | Competes with daily claim volume | Set aging thresholds that trigger review |
| Not tracking payer-specific patterns | Each payer worked the same generic way | Log recurring issues by payer |
| Disconnected front-end/back-end teams | Registration and billing work in silos | Create a shared pre-submission checkpoint |
Metrics worth watching in 2026
| Metric | What It Tells You |
|---|---|
| Initial denial rate | How often claims are denied on first submission |
| Final denial rate | How many denials stay unresolved after appeal |
| Clean claim rate | How many claims are accepted without edits |
| Days in A/R | How long it takes to collect payment |
| Appeal success rate | How effective the appeals process is |
| Underpayment identification rate | Revenue caught through payment audits vs. missed |
| Payer-specific denial trends | Whether issues are systemic or plan-specific |
There's no universal "ideal" percentage for most of these — acceptable ranges vary by specialty, payer mix, and practice size. What matters more is the trend line over time.
Is Your Practice Stuck in the Same Denial Cycle?
Denial management isn't just about resubmitting rejected claims faster. It's about identifying where the process breaks down, understanding why, and confirming the issue doesn't keep coming back. Sirius Solutions Global works with practices across 40+ states and 50+ specialties to identify where claims stall — before submission, during adjudication, and after a denial — through professional denial management, root-cause analytics, and consistent A/R follow-up. The goal isn't fewer denials on paper — it's fewer repeat problems and less revenue sitting stuck in unworked queues.
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