Claim scrubbing inside eClinicalWorks catches a lot — but not everything. Here are the errors that still slip through and what your practice can do about them.
Every claim that leaves eClinicalWorks passes through a built-in scrubbing layer before it reaches the clearinghouse. The system checks for basic formatting issues, missing fields, and obvious coding mismatches. When it works, claims move cleanly through TriZetto and on to the payer.
When it doesn't, you get denials. And denials cost more than the missed payment — industry benchmarks often cite more than $25 to rework a single denied claim, and roughly half to two-thirds of denied claims are never reworked at all. That's revenue your practice earned but never collected.
This guide breaks down the most common claim scrubbing errors in eClinicalWorks, explains why they happen, and shows you how to prevent them — whether you're handling billing in-house or evaluating whether your current process is catching enough.
What Claim Scrubbing Actually Does Inside eCW
Claim scrubbing is the pre-submission review that audits every claim for coding errors, missing data, and payer rule violations before the claim reaches the insurer. Inside eClinicalWorks, this happens at two levels:
Automated edits. eCW runs each claim through a rules engine that checks for structural problems — missing fields, invalid code combinations, basic formatting. These are the edits that catch things like a blank date of birth or an expired CPT code.
Clearinghouse-level scrubbing. After leaving eCW, claims pass through the integrated clearinghouse (TriZetto Provider Solutions), which applies its own set of edits. This second pass catches additional issues — ANSI X12 837 format compliance, HIPAA transaction standards, and some payer-specific rules.
Together, these two layers filter out a large percentage of obvious errors. But "obvious" is the key word. The errors that cause the most revenue damage are the ones that pass both layers and get denied weeks later at the payer level.
The 9 Most Common Claim Scrubbing Errors in eClinicalWorks
1. Place of Service (POS) Mismatches
This is one of the most frequent — and most avoidable — errors in eCW billing. The Place of Service code tells the payer where the service was rendered (office, telehealth, outpatient hospital, etc.), and it directly affects reimbursement rates and coverage rules.
Why it happens: Providers see patients across multiple locations — office visits, telehealth, skilled nursing facilities — and the POS code doesn't always update correctly in eCW when the encounter type changes. If your practice shifted to telehealth during the pandemic and templates weren't updated, POS 11 (office) may still be defaulting on telehealth claims that should show POS 02.
How to fix it: Audit your eCW encounter templates by location and visit type. Make sure each template pulls the correct POS code automatically. Set up a custom claim edit rule in eCW that flags any claim where the POS code doesn't match the appointment type.
2. Incorrect or Outdated CPT and ICD-10 Codes
Medical codes change every year. CPT codes are updated annually by the AMA, and ICD-10 codes receive regular revisions from CMS. A code that was valid last year may be deleted or replaced this year. Official references such as the AMA CPT resource hub and CMS ICD-10 updates help teams stay current.
Why it happens: eCW's scrubber checks whether a code exists in the system, but it won't always catch a code that's technically valid but clinically inappropriate for the documented encounter. It also won't flag a situation where a more specific ICD-10 code should have been used instead of an unspecified one — and many payers now reject unspecified codes.
How to fix it: Run a quarterly code audit against the latest CMS and AMA updates. Train providers to use the most specific ICD-10 code available rather than defaulting to unspecified codes. Use eCW's diagnosis search to pull from current code sets rather than relying on favorites lists that may contain outdated entries.
3. Diagnosis-to-Procedure Mismatches (Medical Necessity Failures)
Every procedure billed must be linked to a diagnosis that justifies it. If the ICD-10 code doesn't logically support the CPT code, the claim fails medical necessity review at the payer — even if both codes are individually valid.
Why it happens: eCW's built-in scrubber checks basic code validity but doesn't fully evaluate Local Coverage Determinations (LCDs) or National Coverage Determinations (NCDs) that define which diagnoses support which procedures for Medicare and Medicaid. A claim can look clean in eCW and still fail because the diagnosis-procedure pair violates a payer-specific coverage rule.
How to fix it: Build custom LCD/NCD-based edit rules in eCW for your highest-volume procedures. If your practice bills Medicare heavily, focus on the procedures that generate the most denials and create specific scrubbing rules for those pairs. Lumexity's Billing Intelligence module can automate this detection in real time.
4. Missing or Invalid Modifier Usage
Modifiers tell the payer additional information about a procedure — whether it was performed bilaterally, by a different provider, or as a distinct service. Missing a required modifier, using the wrong one, or overusing modifiers are all denial triggers.
Why it happens: Modifier rules vary by payer, and eCW's standard scrubbing doesn't cover every payer-specific modifier requirement. Common issues include missing Modifier 25 on E&M services billed with procedures, incorrect use of Modifier 59 for distinct services, and failing to append the appropriate telehealth modifier.
How to fix it: Create modifier checklists by procedure type and payer. Set up eCW claim edit rules that flag high-risk modifier scenarios — for example, any surgical claim without a modifier review, or any E&M + procedure combination without Modifier 25.
5. Patient Demographic and Insurance Errors
Demographic errors are among the most common causes of claim rejection, and they're the most preventable. A misspelled patient name, incorrect date of birth, wrong subscriber ID, or mismatched gender code will stop a claim before it even reaches clinical review at the payer.
Why it happens: These errors originate at registration, not at billing. If your front desk enters insurance information incorrectly — or if a patient's coverage changed and the system wasn't updated — every claim generated from that encounter inherits the bad data.
How to fix it: Run eligibility verification before every visit using eCW's built-in eligibility check or an integrated tool like Lumexity's Eligibility Dashboard. This catches coverage lapses, inactive policies, and subscriber ID mismatches before the encounter even begins.
6. Duplicate Claims
Submitting the same claim twice triggers an automatic denial from most payers. It can also flag your practice for audit if it happens frequently.
Why it happens: In eCW, duplicate claims usually result from workflow issues — a biller resubmits a claim that was already sent, or a batch submission includes claims that were individually submitted earlier. Sometimes a claim gets stuck in a "pending" status, and a team member creates a new one instead of resolving the original.
How to fix it: Before resubmitting any claim, check the claim status in eCW's claims module. Filter by patient, date of service, and CPT code to confirm whether a claim has already been submitted. Establish a standard workflow that requires billers to check claim history before creating or resending claims.
7. Missing Prior Authorization
Certain procedures, referrals, and specialty visits require prior authorization from the payer. If the authorization number isn't on the claim — or if the authorization expired before the service date — the claim will be denied.
Why it happens: Authorization management in eCW requires manual tracking unless your practice has built workflows around it. The scrubber won't know whether a particular payer requires auth for a given procedure unless you've configured that rule.
How to fix it: Maintain an authorization tracking process tied to your scheduling workflow. When an appointment is scheduled for a procedure that typically requires auth, flag it for verification. In eCW, attach the authorization number directly to the encounter so it flows automatically to the claim.
8. Payer-Specific Rule Violations
This is the category that causes the most frustration because the claim looks clean inside eCW but gets denied by the payer. Every insurance company has its own set of billing rules — Medicaid variations, managed care modifier requirements, timely filing windows, bundling rules — and these rules change frequently.
Why it happens: eCW's built-in scrubbing applies generic edits. It doesn't maintain a live, payer-by-payer rules database that updates monthly. If your practice bills across a diverse payer mix — commercial, Medicare, Medicaid, managed care — the gap between what eCW catches and what payers require grows wider.
How to fix it: Track your denial reasons by payer quarterly. Identify patterns — which payers deny most often, for which reason codes. Then build custom claim edit rules in eCW that address your top denial reasons. This is where automated scrubbing technology adds the most value, because it can maintain payer-specific rule sets and update them continuously.
9. Incomplete or Missing Documentation
A claim can be technically correct — right codes, right modifiers, right POS — and still get denied if the supporting documentation doesn't justify the services billed. This is especially common with E&M level selection, time-based codes, and procedures that require clinical notes.
Why it happens: The disconnect is between clinical documentation and billing. If the provider's note doesn't support the level of service billed — or if required elements are missing from the note — the claim is vulnerable to post-payment audit or outright denial.
How to fix it: Align your documentation templates in eCW with billing requirements. For time-based codes, make sure the template captures total time. For E&M visits, ensure the note supports the complexity level being billed. Periodic chart-to-claim audits can identify patterns where documentation consistently falls short.
Why eCW's Built-In Scrubbing Isn't Enough
eClinicalWorks' scrubber is effective at catching structural errors — missing fields, invalid formats, basic code checks. It's a necessary first layer. But it has limitations that every billing team should understand:
- It doesn't track payer-specific rules in real time. Payers update their policies monthly, and eCW's generic edits don't keep pace with every commercial, Medicare, and Medicaid rule change.
- It doesn't evaluate medical necessity against LCDs and NCDs. A claim can pass eCW's scrubber with a valid CPT and a valid ICD-10, but if that specific combination isn't covered by the patient's payer, it will be denied.
- It doesn't catch documentation gaps. The scrubber reviews the claim form, not the clinical note behind it. If the documentation doesn't support the code, that's invisible to automated scrubbing.
- It doesn't learn from your denial patterns. Generic scrubbing applies the same rules to every practice. It doesn't adapt based on which denials your practice actually receives or which payers cause the most problems.
This is the gap that technology-powered billing is designed to close. At Lumexity, our Billing Copilot adds an intelligent scrubbing layer on top of eCW — one that applies payer-specific rules, flags medical necessity risks, and learns from your practice's actual denial data. Combined with Billing Intelligence for real-time error monitoring and the Eligibility Dashboard for pre-visit verification, the goal is simple: catch the errors that eCW's scrubber misses, before they become denials.
A Practical Claim Scrubbing Checklist for eCW Practices
Before every claim leaves your eClinicalWorks system, your team should verify:
- Patient demographics match the insurance card — name spelling, date of birth, subscriber ID, group number.
- Eligibility was verified for the date of service — active coverage, correct plan, no coordination of benefits issues.
- Place of Service code is correct for the encounter type — office, telehealth, facility, SNF.
- CPT and ICD-10 codes are current — no deleted or replaced codes, most specific diagnosis code used.
- Diagnosis supports the procedure — the ICD-10/CPT pair passes medical necessity for the patient's payer.
- Required modifiers are present — especially for E&M + procedure combos, bilateral procedures, and telehealth.
- Prior authorization is attached if required by the payer for the procedure performed.
- No duplicate claim exists for the same patient, date of service, and procedure.
- Documentation supports the billed service — the note justifies the level, the time, or the complexity being billed.
Stop Losing Revenue to Preventable Denials
Claim scrubbing errors in eClinicalWorks aren't a technology failure — they're a gap between what the system catches and what payers require. Closing that gap means combining eCW's built-in tools with smarter scrubbing, better eligibility workflows, and continuous denial analysis.
If your eCW practice is seeing denial rates above 5%, claims aging beyond 40 days, or recurring rejections for the same error types, the scrubbing layer is where to start.
Talk to Lumexity — we'll connect to your eClinicalWorks instance and show you exactly where claims are falling through — no sales pitch, just data.
Frequently asked questions
Quick answers on eCW claim scrubbing — each topic is covered in depth in the sections above.
What does claim scrubbing do in eClinicalWorks?
Claim scrubbing is a pre-submission review that checks each claim for coding errors, missing data, and basic payer-rule violations before submission. In eCW, automated edits run inside the system; claims then pass through the integrated clearinghouse (TriZetto Provider Solutions) for a second layer of edits including X12 837 and HIPAA transaction checks.
Why do eClinicalWorks claims still get denied if scrubbing passed?
Built-in and clearinghouse scrubbing catch many structural and format issues, but payer-specific rules, medical necessity under LCDs and NCDs, documentation gaps, and modifier requirements often differ by plan. A claim can look clean in eCW and still fail when the payer applies its own policies.
What are the most common eClinicalWorks claim scrubbing errors?
Frequent issues include place of service mismatches, outdated or clinically misaligned CPT and ICD-10 codes, diagnosis-to-procedure mismatches for medical necessity, missing or incorrect modifiers, demographic and insurance errors from registration, duplicate submissions, missing prior authorization, payer-specific rule violations, and documentation that does not support the level or type of service billed.
Is eClinicalWorks built-in claim scrubbing enough on its own?
It is an important first layer for missing fields, invalid formats, and basic code checks, but it does not maintain a live payer-by-payer rule set, fully evaluate LCD or NCD medical necessity, audit clinical notes, or adapt from your practice’s historical denial patterns. Most high-impact denials require additional workflows or intelligent scrubbing beyond generic edits.
How can a practice reduce claim scrubbing and denial rates in eCW?
Verify eligibility before every visit, align encounter templates and POS codes by visit type, refresh code sets quarterly, build custom claim edits for top denial reasons, track authorizations in scheduling, prevent duplicate resubmissions, and periodically audit chart-to-claim documentation. Technology that applies payer-specific rules and denial learning on top of eCW closes gaps generic scrubbing leaves open.
Sources & further reading
- CMS — Medicare Coverage Database (LCD/NCD references for medical necessity)
- AMA — CPT (annual coding updates)
- Industry RCM surveys and HFMA guidance on denial rework cost and recovery rates (figures vary by specialty and payer mix; use as directional benchmarks)