What Is a Medical Clearinghouse? How Claims Processing Works

A medical clearinghouse is a third-party entity that receives electronic healthcare claims from providers, validates and reformats them to meet payer-specific requirements, and transmits them to the appropriate insurance payers for adjudication. Clearinghouses serve as intermediaries between healthcare providers and insurance companies, translating claim data into the standardized formats required by each payer and screening claims for errors before submission.

Before clearinghouses existed, every healthcare provider had to establish a direct connection with every insurance payer — each with its own data format, submission requirements, and communication protocols. A multi-payer practice would need to manage dozens of separate submission processes. Clearinghouses solved this problem by creating a single connection point: providers submit all claims to the clearinghouse, and the clearinghouse routes each claim to the correct payer in the correct format.

Today, clearinghouses process more than 7 billion healthcare transactions annually in the United States, according to CAQH. They handle not only claims (837 transactions) but also eligibility inquiries (270/271), claim status requests (276/277), remittance advice (835), and prior authorization transactions (278). The clearinghouse model has become so embedded in the healthcare payment infrastructure that approximately 95% of electronic medical claims pass through a clearinghouse rather than being submitted directly to payers.

This guide covers how clearinghouses work, their role in the claims submission process, the transaction types they handle, claim scrubbing, clearinghouse fees, the major clearinghouse vendors, direct versus clearinghouse submission, and how AI is changing the traditional clearinghouse model.

Quick Facts: Medical Clearinghouses

Fact	Detail
Definition	Third-party intermediary that validates, formats, and routes electronic healthcare claims between providers and payers
HIPAA classification	Healthcare clearinghouse (one of three HIPAA covered entity types)
Primary function	Translate provider claim data into payer-specific formats and screen for errors
Transaction volume	7+ billion healthcare transactions per year in the US
Market share	~95% of electronic claims pass through a clearinghouse
Key transactions	837 (claims), 835 (remittance), 270/271 (eligibility), 276/277 (claim status), 278 (prior auth)
Major vendors	Change Healthcare (Optum), Availity, Trizetto (Cognizant), Waystar, Inovalon, Office Ally
Typical cost	$0.25-$0.75 per claim (volume-dependent)
Regulatory authority	HIPAA Administrative Simplification provisions; CMS

How Medical Clearinghouses Work

The clearinghouse sits between the provider and the payer in the claims submission workflow. Here is how the process works:

The Claims Flow: Provider to Clearinghouse to Payer

Provider                    Clearinghouse                    Payer
   |                            |                              |
   |  1. Submit claim (837)     |                              |
   |--------------------------->|                              |
   |                            |  2. Validate format          |
   |                            |  3. Scrub for errors         |
   |                            |  4. Reformat to payer specs  |
   |                            |                              |
   |                            |  5. Transmit to payer        |
   |                            |----------------------------->|
   |                            |                              |
   |                            |  6. Receive acknowledgment   |
   |                            |<-----------------------------|
   |  7. Report status          |                              |
   |<---------------------------|                              |
   |                            |                              |
   |                            |  8. Receive ERA/835          |
   |                            |<-----------------------------|
   |  9. Deliver ERA/835        |                              |
   |<---------------------------|                              |

Step-by-Step Process

Step 1: Provider submits the claim

The provider's billing system or practice management system generates a claim in the HIPAA 837 format (837P for professional claims, 837I for institutional claims). The claim file is transmitted electronically to the clearinghouse — typically through a direct connection, SFTP, web portal, or API.

Step 2: Clearinghouse validates the format

The clearinghouse validates the claim file against HIPAA formatting standards. It checks that the 837 file is structurally correct — required segments are present, data types are valid, code sets are current, and the file can be parsed. Claims that fail format validation are rejected back to the provider with specific error descriptions.

Step 3: Clearinghouse scrubs the claim

Beyond format validation, the clearinghouse performs claim scrubbing — checking the claim content against billing rules, coding edits, and payer-specific requirements. Scrubbing checks include:

• Code validity: Are the ICD-10, CPT, and HCPCS codes valid and current?
• Code combinations: Are the diagnosis-procedure code combinations valid? Are CCI (Correct Coding Initiative) edits satisfied?
• Required fields: Are all payer-required fields populated (NPI, tax ID, place of service, referring provider)?
• Duplicate detection: Is this claim a duplicate of a previously submitted claim?
• Modifier validation: Are required modifiers present and valid?
• Patient and subscriber validation: Do the patient and subscriber identification numbers match the payer's records?

Claims that fail scrubbing edits are rejected back to the provider with specific error codes. The provider corrects the errors and resubmits through the clearinghouse.

Step 4: Clearinghouse reformats for the payer

While HIPAA standardized the 837 transaction format, payers still have payer-specific companion guides that detail their particular data requirements, field usage, and formatting preferences. The clearinghouse reformats the claim to meet each payer's specific requirements, including:

• Payer-specific field mapping
• Required qualifiers and identifiers unique to the payer
• Supplemental data formatting (attachments, additional documentation references)
• Submission channel specifications (some payers accept claims only through specific gateways)

Step 5: Clearinghouse transmits to the payer

The clearinghouse routes the validated, scrubbed, and reformatted claim to the correct payer through the payer's designated submission channel. Large clearinghouses maintain direct connections with hundreds of payers.

Step 6: Payer sends acknowledgment

The payer sends an acknowledgment (999 transaction) confirming receipt of the claim file. If the payer rejects the file (format errors at the payer level), the rejection is communicated back through the clearinghouse.

Step 7: Clearinghouse reports status to the provider

The clearinghouse compiles acceptance and rejection reports and makes them available to the provider — typically through the clearinghouse portal, automated reports, or direct integration with the provider's billing system.

Step 8-9: Remittance flows back

After the payer adjudicates the claim, the payment and remittance information (835 transaction) flows back through the clearinghouse to the provider. The clearinghouse may also deliver payer-generated EOBs and other correspondence.

Types of Transactions Clearinghouses Handle

Clearinghouses process far more than just claims. They handle the full spectrum of HIPAA standard transactions:

Transaction	HIPAA Standard	Direction	Purpose
Health Care Claim	837P (Professional) / 837I (Institutional)	Provider → Payer	Submit claims for payment
Health Care Payment/Remittance	835	Payer → Provider	Payment information and adjustment details
Eligibility Inquiry/Response	270/271	Provider ↔ Payer	Verify patient insurance coverage and benefits
Claim Status Inquiry/Response	276/277	Provider ↔ Payer	Check status of submitted claims
Health Care Services Review	278	Provider ↔ Payer	Prior authorization requests and responses
Enrollment/Disenrollment	834	Sponsor ↔ Payer	Benefits enrollment data
Premium Payment	820	Sponsor → Payer	Premium payment information
Implementation Acknowledgment	999	Receiver → Sender	Confirm receipt of transaction

Claim Scrubbing: The Clearinghouse's Core Value

Claim scrubbing is arguably the most valuable function a clearinghouse performs. By catching errors before claims reach the payer, clearinghouses prevent rejections and denials that would otherwise delay payment by weeks or months.

What Claim Scrubbing Catches

Error Type	Example	Without Scrubbing
Invalid codes	Deleted ICD-10 code used	Claim rejected by payer
Missing required fields	No referring provider NPI on a referral claim	Claim rejected
CCI edit violations	Two procedure codes that cannot be billed together	Claim denied
Gender/age conflicts	Male patient with a female-only diagnosis code	Claim denied
Duplicate claims	Same service, same date, same provider submitted twice	Payment recoupment risk
Invalid modifier combinations	Incompatible modifiers on the same service line	Claim denied
Place of service errors	Code inconsistent with procedure or provider type	Underpayment or denial
Missing authorization	Prior auth required but authorization number not included	Claim denied

Scrubbing Impact on Clean Claim Rates

The industry defines a "clean claim" as a claim that passes all validation checks and can be adjudicated without additional information from the provider. Clearinghouse scrubbing typically improves clean claim rates by 5-15 percentage points:

• Without scrubbing: 75-85% first-pass clean claim rate
• With clearinghouse scrubbing: 85-95% first-pass clean claim rate
• With advanced AI-powered scrubbing: 95-98% first-pass clean claim rate

Major Medical Clearinghouses

Change Healthcare (Optum/UnitedHealth Group)

The largest clearinghouse in the United States, processing approximately 15 billion transactions annually. Change Healthcare connects to over 5,500 hospitals, 900,000 physicians, and 2,400+ payers. Acquired by Optum (UnitedHealth Group) in 2022. The February 2024 cyberattack on Change Healthcare disrupted claims processing across the US healthcare system for weeks, highlighting the industry's dependence on clearinghouse infrastructure.

Availity

A multi-payer health information network founded as a joint venture between Florida Blue and Humana. Availity processes transactions for over 2 million providers and connects to major payers including Anthem, Humana, Florida Blue, and many state Medicaid programs. Availity's portal provides real-time eligibility, claims status, and prior authorization access.

Trizetto (Cognizant)

A healthcare IT and clearinghouse company acquired by Cognizant in 2014. Trizetto's Gateway EDI platform processes claims and provides revenue cycle management solutions. Strong in the physician practice and small hospital segments.

Waystar

Formed through the merger of Navicure and ZirMed in 2017, Waystar provides clearinghouse services alongside a broader revenue cycle platform. Waystar processes claims for over 500,000 providers and connects to 5,000+ payers. The platform includes claim scrubbing, denial management, and analytics.

Inovalon

Provides clearinghouse and data analytics services with a focus on quality reporting, risk adjustment, and value-based care. Inovalon's ABILITY Network processes electronic transactions for over 85,000 provider sites.

Office Ally

A low-cost clearinghouse popular with small practices and individual providers. Office Ally offers free electronic claim submission (for standard claims), with charges for additional features. Connects to over 5,000 payers.

Clearinghouse Fees and Cost Structure

Clearinghouse pricing varies based on transaction volume, services included, and the provider's negotiating leverage.

Common Fee Structures

Fee Type	Typical Range	Notes
Per-claim fee	$0.25-$0.75 per claim	Most common model; decreases with volume
Monthly flat fee	$75-$500/month	Includes a defined number of claims; overage charges apply
Per-transaction fee	$0.10-$0.50 per transaction	Covers all transaction types (eligibility, claims, remittance)
Percentage of collections	0.5-2% of collected revenue	Less common; aligns clearinghouse cost with revenue
Setup/implementation fee	$0-$500 one-time	Initial account configuration and payer enrollment
ERA delivery fee	$0-$0.25 per ERA	Some clearinghouses charge for 835 delivery

Cost Factors

• Volume: Higher claim volume typically results in lower per-claim rates
• Payer mix: Some payers charge the clearinghouse for connectivity, which may be passed through to the provider
• Additional services: Claim scrubbing, analytics, denial management, and eligibility verification may be included or cost extra
• Contract length: Multi-year contracts may offer lower rates
• Bundling: Providers using the clearinghouse as part of a broader revenue cycle platform may receive bundled pricing

Total Cost Calculation Example

A 10-provider primary care practice submitting 5,000 claims per month:

• Per-claim fee at $0.35: $1,750/month
• Monthly platform fee: $150/month
• ERA delivery: included
• Annual cost: approximately $22,800
• Cost per claim: $0.38 (including platform fee)

Direct Submission vs. Clearinghouse Submission

Some providers submit claims directly to payers, bypassing the clearinghouse. This is most common for organizations with a dominant payer relationship (such as a provider that sends 80% of claims to one payer) or for government payers (Medicare, Medicaid) that offer direct submission gateways.

Direct Submission

Advantages	Disadvantages
No clearinghouse fees	Must manage separate connection for each payer
Direct relationship with payer	No pre-submission scrubbing
Potentially faster transmission	Must handle formatting for each payer individually
Required for some government programs	More complex technical infrastructure

Clearinghouse Submission

Advantages	Disadvantages
Single connection to hundreds of payers	Per-claim fees add up
Pre-submission claim scrubbing	Adds an intermediary to the process
Payer-specific formatting handled automatically	Dependence on clearinghouse availability
ERA aggregation from all payers	Less direct control over submission
Eligibility, claims status, and other transactions in one place	Potential data privacy considerations

Medicare Direct Submission

CMS operates the Medicare Administrative Contractor (MAC) system, which accepts claims directly from providers. Medicare direct submission is available through the Direct Data Entry (DDE) system for institutional providers and through MAC-specific portals. Many providers still use clearinghouses for Medicare claims for the convenience of routing all claims through a single channel.

Clearinghouses Under HIPAA

Under HIPAA, healthcare clearinghouses are one of three types of covered entities (along with health plans and healthcare providers who transmit electronic transactions). As covered entities, clearinghouses must:

• Comply with HIPAA Privacy Rule requirements for protected health information (PHI)
• Implement HIPAA Security Rule administrative, physical, and technical safeguards
• Report breaches of unsecured PHI under the Breach Notification Rule
• Use HIPAA-standard transaction formats and code sets
• Enter into Business Associate Agreements (BAAs) with providers

The Change Healthcare cyberattack of February 2024 underscored the critical importance of clearinghouse security. The attack disrupted claims processing, payment delivery, and eligibility verification for providers across the country, with financial impacts estimated at over $2 billion for the healthcare industry. This event has intensified regulatory scrutiny of clearinghouse security practices and spurred providers to evaluate contingency plans for clearinghouse outages.

How AI Is Changing the Clearinghouse Model

AI and automation are transforming the traditional clearinghouse model in several ways.

Enhanced Claim Scrubbing

Traditional clearinghouse scrubbing uses rule-based editing — checking claims against a static set of billing rules. AI-powered scrubbing goes further by analyzing historical denial patterns, payer-specific adjudication behaviors, and claim-level features to predict which claims are likely to be denied and why. This predictive scrubbing catches issues that rule-based systems miss, pushing first-pass clean claim rates above 96%.

Intelligent Claim Routing

AI optimizes how claims are routed to payers by analyzing payer processing patterns, identifying the fastest submission channels, and timing submissions to align with payer processing schedules. This reduces the time from submission to adjudication.

Automated Error Resolution

When claims are rejected, AI automatically diagnoses the error, applies the correction, and resubmits — without human intervention for routine errors. Missing modifiers are appended, invalid codes are updated, and formatting issues are corrected automatically.

Payer-Specific Optimization

AI learns payer-specific adjudication patterns and optimizes claims for each payer before submission. If a specific payer consistently denies claims with a particular diagnosis-procedure combination unless a specific modifier is present, the AI adds that modifier proactively.

Reducing Clearinghouse Dependency

As AI-powered billing platforms gain the ability to perform claim scrubbing, payer-specific formatting, and direct payer submission through APIs and FHIR-based connections, the traditional clearinghouse intermediary model is being challenged. Platforms that can submit directly to payers while providing superior scrubbing and analytics may reduce the need for separate clearinghouse services.

QuickIntell's claims platform integrates advanced AI-powered claim scrubbing with multi-payer connectivity, processing claims through intelligent validation that catches errors traditional clearinghouse scrubbing misses. The platform's predictive denial engine analyzes each claim against payer-specific historical patterns before submission, achieving first-pass clean claim rates above 97%. For organizations currently spending $20,000-$50,000 annually on clearinghouse fees, QuickIntell's integrated approach often replaces or supplements clearinghouse functionality while delivering superior claims outcomes.

Choosing a Medical Clearinghouse

Key Evaluation Criteria

Criterion	What to Assess
Payer connectivity	Number of payers connected; connectivity to your specific payer mix
Transaction types	Claims, eligibility, claim status, ERA, prior auth — or only some?
Scrubbing quality	Depth of claim scrubbing rules; payer-specific vs. generic edits
Integration	Compatibility with your EHR and practice management system
Reporting and analytics	Claim tracking, denial analytics, clean claim metrics
Uptime and reliability	Service level agreements; disaster recovery capabilities
Security	SOC 2 certification, HIPAA compliance, breach history
Customer support	Response times, dedicated account management, technical support
Pricing	Per-claim vs. flat fee; volume discounts; hidden fees
Contingency planning	What happens if the clearinghouse goes down? Backup submission options?

Frequently Asked Questions

What is a medical clearinghouse?

A medical clearinghouse is a third-party company that acts as an intermediary between healthcare providers and insurance payers. It receives electronic claims from providers, checks them for errors (claim scrubbing), reformats them to meet each payer's specific requirements, and transmits them to the correct payer for processing. It also delivers payment information (ERAs/835s) from payers back to providers. Think of it as a translator and router — it speaks the language of every payer so your billing system only needs to speak one language.

Why do healthcare providers use clearinghouses?

Providers use clearinghouses because they simplify the claims submission process. Without a clearinghouse, a provider would need to establish and maintain a separate electronic connection with every insurance payer they bill — potentially hundreds of payers, each with different formatting requirements. A clearinghouse provides a single connection point and handles the payer-specific formatting, scrubbing, and routing. This saves significant IT infrastructure costs and staff time.

How much does a medical clearinghouse cost?

Clearinghouse costs typically range from $0.25 to $0.75 per claim, depending on volume and the services included. Some clearinghouses charge a monthly flat fee ($75-$500) plus per-claim overage charges. Additional costs may apply for ERA delivery, eligibility transactions, prior authorization, and advanced analytics. For a practice submitting 5,000 claims per month at $0.35 per claim, the annual clearinghouse cost would be approximately $21,000.

What is claim scrubbing?

Claim scrubbing is the process of checking a medical claim for errors before it is submitted to the insurance payer. The clearinghouse reviews each claim against billing rules, coding guidelines (such as CCI edits), payer-specific requirements, and format standards. Claims that fail scrubbing are returned to the provider with specific error descriptions for correction before resubmission. Effective claim scrubbing reduces rejections and denials by catching errors that would otherwise delay payment.

What is the difference between a clearinghouse rejection and a payer denial?

A clearinghouse rejection occurs before the claim reaches the payer — the clearinghouse identifies an error during scrubbing and returns the claim to the provider for correction. A payer denial occurs after the payer receives and reviews the claim — the payer determines that the claim does not meet criteria for payment. Rejections are typically formatting or data errors; denials are typically clinical or coverage issues. Rejections are generally easier and faster to resolve than denials.

Can I submit claims directly to payers without a clearinghouse?

Yes, but it requires establishing individual connections with each payer you bill. Medicare and Medicaid offer direct submission gateways. Some large commercial payers also accept direct submissions. However, direct submission means you handle all formatting, compliance, and error checking yourself — without the clearinghouse's scrubbing and translation services. For practices billing multiple payers, the convenience and error-reduction benefits of a clearinghouse typically outweigh the per-claim cost.

What happened with the Change Healthcare cyberattack?

In February 2024, Change Healthcare — the largest medical clearinghouse in the US — suffered a ransomware cyberattack that disrupted claims processing, payment delivery, and eligibility verification for healthcare providers nationwide. The attack exposed the healthcare industry's concentration risk in relying on a single clearinghouse. Financial impacts exceeded $2 billion across the industry. The incident prompted many providers to evaluate backup clearinghouse relationships and contingency plans for clearinghouse outages.

How are clearinghouses regulated?

Medical clearinghouses are classified as covered entities under HIPAA and must comply with HIPAA Privacy, Security, and Breach Notification Rules. They must use HIPAA-standard transaction formats (X12 837, 835, 270/271, 276/277, 278) and code sets. Clearinghouses are subject to CMS oversight for Medicare-related transactions and must meet state-specific requirements for Medicaid transactions. Following the Change Healthcare incident, regulatory attention to clearinghouse cybersecurity and operational resilience has increased significantly.