Claim Submission Process in Medical Billing: A Complete Guide for Providers

Submitting a medical claim is not just about sending a bill to an insurance company. A lot happens before and after that claim is submitted, and even a small mistake can slow down payment or lead to a denial.

The claim submission process in medical billing starts with collecting the right patient and insurance information. From there, the provider’s documentation must support the services performed, the correct medical codes must be assigned, and the claim must be checked carefully before it is sent to the payer. Once submitted, the billing team still needs to track the claim, review the payer’s response, post payments, and deal with any rejections or denials.

For healthcare practices, these steps have a direct impact on cash flow. A service may be medically necessary and properly performed, but payment can still be delayed because of something as simple as an incorrect insurance ID, missing information, a coding error, or an authorization issue.

This guide walks through the medical claim submission process from the patient encounter to final payment. It also explains where claims commonly run into problems and what billing teams can do to improve accuracy, reduce denials, and keep reimbursement moving more smoothly.

What Is the Claim Submission Process in Medical Billing?

The claim submission process in medical billing is the workflow used to convert documented healthcare services into a standardized claim that is transmitted to a health plan for reimbursement.

In a typical workflow, the provider verifies coverage, documents the encounter, assigns applicable diagnosis and procedure codes, prepares and validates the claim, submits it electronically, reviews payer acknowledgments, monitors claim status, and processes the final remittance.

Under HIPAA Administrative Simplification requirements, HHS has adopted standardized electronic transactions for healthcare claims. The ASC X12N 837 Version 5010 is the adopted standard for electronic institutional, professional, and dental health claims.

For providers, claim submission is therefore not a single billing event. It is one part of a broader revenue cycle that connects scheduling, registration, clinical documentation, coding, charge capture, reimbursement, accounts receivable, and denial management.

Why Accurate Claim Submission Matters

A medical insurance claim gives the payer the details needed to identify the patient and provider, understand what services were delivered and why, confirm where the care took place, and decide how the claim will be handled under the patient’s insurance coverage.

Mistakes at any point can disrupt claims processing.

For example, a claim may encounter problems because of:

• Incorrect patient demographics
• An invalid insurance member ID
• Inactive coverage
• Missing prior authorization when required
• Incorrect provider information
• Diagnosis or procedure coding errors
• Missing or inappropriate modifiers
• Incorrect place-of-service information
• Duplicate billing
• Missing required claim information
• Failure to meet the payer’s filing deadline

The practical goal is not simply to submit claims faster. It is to submit claims that are complete, internally consistent, supported by documentation, and compliant with applicable payer and coding requirements.

A well-controlled claim workflow usually follows the stages below.

1. Patient Registration and Demographic Collection

Claim accuracy starts before the clinician provides the service.

Front-office staff need to collect and verify key information such as:

• Patient’s legal name
• Date of birth
• Address
• Contact information
• Insurance carrier
• Member or subscriber ID
• Group number, where applicable
• Subscriber information
• Relationship to subscriber
• Coordination-of-benefits information when multiple plans are involved

Small mistakes in data entry can lead to serious issues later on. A claim may not be approved or handled properly due to a misspelt name, an out-of-date insurance policy, or an invalid member number.

Instead than depending on data gathered from a previous visit, practices must confirm insurance and demographic information.

2. Eligibility and Benefits Verification

The next stage is checking whether the patient’s health plan is active and understanding relevant benefit information.

Eligibility verification may help determine:

• Whether coverage is active
• Effective dates
• Copay requirements
• Deductible information
• Coinsurance
• Network status
• Coverage for particular service categories

HIPAA‘s standard electronic eligibility transactions are the 270 eligibility inquiry and 271 eligibility response. CMS notes that eligibility operating rules support access to information including deductibles, copays, coinsurance, network differences, and coverage for specific types of services.

Eligibility verification alone does not ensure payment of a particular claim. Coverage and reimbursement are still dependent on the service performed, medical necessity, authorisation criteria, coding, plan limitations, paperwork and other payer rules.

3. Prior Authorization and Referral Verification

Some services require authorization or referral approval before they are performed.

The billing or authorization team needs to confirm:

• Whether authorization is required
• Which services are authorized
• The approved date range
• Applicable units or visits
• Whether a referral is required
• Whether the rendering provider and facility meet payer requirements

An authorization number by itself does not necessarily guarantee payment. The actual claim still needs to satisfy the payer’s coverage, billing, documentation, coding, and contractual requirements.

4. Clinical Documentation

Once the service is delivered, the medical record becomes a critical foundation for billing.

• Documentation needs to accurately support:

• The service provided
• Diagnoses addressed
• Medical necessity when applicable
• Relevant clinical findings
• Procedures performed
• Time or other code-specific requirements when applicable
• Provider participation in the service
• Any information required by the code or payer

• Billing teams need to avoid selecting codes solely because they offer higher reimbursement. Codes must be supported by the medical record and applicable coding guidelines.

5. Medical Coding

After documentation is completed, the encounter is translated into standardized healthcare codes.

Depending on the setting and claim, these can include:

ICD-10-CM codes
Used to report diagnoses and health conditions.

CPT/HCPCS codes
Used primarily to describe professional services, procedures, products, supplies, and other billable items as applicable.

ICD-10-PCS codes
Used for inpatient hospital procedure reporting in applicable settings.

CMS refers to CPT as HCPCS Level I . CMS states that HCPCS Level II is largely used to identify items, supplies, procedures, and services not covered in CPT . CMS also tells providers to apply relevant modifiers and place-of-service codes when applicable.

The choice of code should be based on documentation, clinical scenario, current coding guidance, and payer-specific restrictions.

6. Charge Entry and Claim Creation

Once coding is complete, billable charges are entered into the practice management or billing system.

Claim data may include:

• Patient information
• Subscriber information
• Payer information
• Billing provider
• Rendering provider
• Provider identifiers
• Dates of service
• Diagnosis codes
• Procedure or service codes
• Modifiers when applicable
• Units
• Charges
• Place of service
• Authorization information when required

For professional claims, electronic submission generally uses the 837P transaction. Institutional claims use the 837I transaction. CMS states that the X12 837 format is used for HIPAA electronic claims.

When paper claims are permitted, commonly used forms include the CMS-1500 for professional claims and CMS-1450/UB-04 for institutional claims, depending on the claim type and payer requirements.

7. Claim Scrubbing

• Before transmission, the claim needs to be checked for errors.

This process is commonly called claim scrubbing.

A claim scrubber or billing system may look for issues such as:

• Missing required fields
• Invalid code formats
• Inconsistent patient information
• Invalid payer identifiers
• Missing modifiers
• Potential coding conflicts
• Invalid place-of-service information
• Missing provider information
• Duplicate claim indicators
• Incomplete authorization data

Automated claim edits can catch many technical errors, but they do not replace knowledgeable billing and coding review.

A claim can pass software edits and still be denied later because the payer determines that coverage, documentation, medical necessity, authorization, or another policy requirement was not satisfied.

8. Claim Submission to the Clearinghouse or Payer

Once validated, the claim is transmitted.

Depending on the organization’s setup, an electronic claim may travel:

Provider → Clearinghouse → Health Plan

or

Provider → Health Plan

A clearinghouse can perform additional formatting and validation checks before forwarding the claim.

CMS explains that electronic Medicare claims undergo initial edits to determine whether they meet basic HIPAA requirements. If errors are identified at certain front-end stages, a batch or individual claim may be rejected and require correction and resubmission.

For Medicare, initial claims generally must be submitted electronically unless the provider or claim qualifies for an applicable waiver or exception.

Commercial payer and Medicaid requirements can differ, so practices should follow the applicable payer’s submission specifications.

9. Review Claim Acknowledgments

Submission does not necessarily mean the payer has accepted the claim for adjudication.

Billing teams should monitor electronic acknowledgments to determine whether the transaction was successfully received and accepted into the payer’s processing system.

This distinction is important because an electronically rejected claim may never reach full adjudication.

A good billing workflow therefore treats claim acknowledgment review as an active responsibility rather than assuming that successful transmission equals successful receipt.

10. Payer Adjudication

Once accepted into the payer’s system, the claim moves through adjudication.

During adjudication, the payer applies relevant benefit, coverage, payment, coding, contractual, and policy rules to determine the disposition of the claim.

A processed claim may ultimately be:

• Paid as billed or according to the payer’s allowed amount
• Partially paid
• Applied to deductible
• Assigned partly to patient responsibility
• Denied
• Suspended or pended for additional information
• Adjusted based on payer policies or contractual terms

The exact process varies among Medicare, Medicaid programs, Medicare Advantage plans, and commercial insurers.

Claim Rejection vs. Claim Denial

These terms are often used interchangeably, but they describe different problems.

Understanding the distinction helps billing teams determine the correct next action.

Repeatedly resubmitting a denied claim without addressing the reason for denial can create duplicate claims and additional work.

11. Claim Status Monitoring

Claims should not disappear into a billing queue after submission.

Billing teams need a consistent process for identifying claims that:

• Were rejected
• Have not been acknowledged
• Remain pending
• Require documentation
• Were denied
• Were underpaid
• Have not received a payer response within the expected workflow

HIPAA uses the 276/277 transaction pair for electronic claim status. The 276 is a claim-status inquiry, while the 277 communicates the payer’s response. CMS notes that electronic claim-status transactions can reduce manual calls and allow status information to be incorporated into provider workflows.

Consistent status monitoring is especially important for accounts receivable management because unresolved claims become harder to correct as payer filing and appeal deadlines approach.

12. Payment and Remittance Processing

After adjudication, providers receive information explaining how the payer handled the claim.

For electronic workflows, an Electronic Remittance Advice (ERA) is commonly provided using the X12 835 transaction.

An ERA can show:

• Allowed amounts
• Paid amounts
• Patient responsibility
• Contractual adjustments
• Deductibles
• Coinsurance
• Denials or reductions
• Adjustment explanations

CMS explains that Claim Adjustment Reason Codes (CARCs) and Remittance Advice Remark Codes (RARCs) are used to explain claim payment adjustments.

Billing staff should reconcile the remittance against the submitted claim rather than simply posting whatever payment was received.

This helps identify underpayments, unexpected adjustments, incorrect patient responsibility, and denials that require action.

13. Payment Posting and Patient Responsibility

Once payer processing is complete, payments and adjustments are posted to the patient’s account.

Accurate payment posting must separate:

• Insurance payment
• Contractual adjustment
• Deductible
• Copayment
• Coinsurance
• Other patient responsibility
• Denied or unresolved balances

Patient billing should reflect payer adjudication, contractual obligations, applicable law, and the patient’s actual financial responsibility.

Billing staff should avoid automatically transferring every unpaid amount to the patient without verifying why the payer did not pay it.

14. Denial Management and Follow-Up

When a medical claim is denied, the next step depends on the denial reason.

Common actions may include:

1. Reviewing the ERA or payer response.
2. Identifying the relevant CARC/RARC or payer explanation.
3. Comparing the denial with the original claim and medical record.
4. Determining whether the issue is administrative, coding-related, authorization-related, coverage-related, or documentation-related.
5. Correcting the claim when appropriate.
6. Supplying requested documentation when appropriate.
7. Submitting an appeal or reconsideration when supported.
8. Tracking the issue until resolution.

The objective should be to correct both the individual claim and the workflow weakness that caused the problem.

If multiple claims are being denied because insurance information is outdated, for example, repeatedly correcting claims after submission is less effective than strengthening eligibility verification before the encounter.

Common Claim Submission Errors

Several problems repeatedly interfere with efficient medical claims processing.

Incorrect Patient Information

Names, birth dates, subscriber details, and policy numbers must match payer records.

Eligibility Problems

Coverage may have terminated, changed, or been replaced by another plan.

Missing Prior Authorization

A service may have required authorization, referral, notification, or another payer-specific approval process.

Coding Errors

Incorrect or unsupported ICD-10-CM, CPT, HCPCS, modifiers, or other claim data can affect claim processing.

Diagnosis and Procedure Mismatch

The diagnoses reported on the claim should accurately represent the documented conditions addressed and support the reported services when required.

Incorrect Place of Service

For professional claims, POS codes identify the setting where care was provided. CMS maintains the POS code set used for professional healthcare claims.

Duplicate Claims

Submitting another claim before understanding the status of the original can create duplicate claim problems.

Missing Documentation

Some claims or payer reviews may require supporting medical documentation.

Timely Filing Problems

Each payer or program can establish applicable filing requirements.

For Medicare fee-for-service claims, CMS states that claims generally must reach the correct Medicare Administrative Contractor no later than one calendar year after the date of service, subject to limited exceptions.

Commercial insurance and Medicaid filing limits may differ, so providers should verify the requirements that apply to each payer and contract.

How to Improve the Claim Submission Process

Healthcare organizations can strengthen claim performance by addressing errors before claims reach the payer.

Verify Coverage Before Services

Build insurance verification into registration and scheduling workflows instead of waiting until a claim rejects.

Maintain Accurate Patient Records

Ask patients to confirm insurance and demographic information regularly.

Check Authorization Requirements Early

Authorization teams need enough time to obtain payer approval when required.

Improve Clinical Documentation

Clear documentation supports coding accuracy and provides evidence when claims require payer review.

Use Current Code Sets

Billing and coding teams should maintain current ICD-10-CM, CPT, HCPCS, modifier, and payer-specific knowledge.

Scrub Claims Before Submission

Automated validation plus knowledgeable billing review can reduce avoidable technical errors.

Monitor Acknowledgments

A transmitted claim should not be considered complete until its acceptance status has been reviewed.

Track Claim Status

Create follow-up rules for claims that remain pending or unresolved.

Analyze Denial Patterns

Do not manage denials only one at a time. Identify trends by:

• Payer
• Provider
• Specialty
• Location
• Procedure
• Denial reason
• Registration issue
• Authorization issue
• Coding issue

Patterns can reveal upstream problems that should be corrected before future claims are submitted.

Example of the Medical Claim Submission Workflow

Consider a patient who schedules an office visit with a participating physician.

The practice first verifies the patient’s insurance coverage and applicable benefits. The patient is seen, and the physician documents the encounter.

A coder or qualified billing professional reviews the documentation and assigns the appropriate diagnosis and procedure codes based on the record and applicable guidelines.

The billing system creates an electronic professional claim. Claim edits are performed, and any identified errors are corrected.

The 837P claim is then transmitted either directly to the payer or through a clearinghouse.

The billing team checks acknowledgments to ensure the claim was accepted. The payer adjudicates the claim and later sends remittance information explaining the payment and adjustments.

The practice posts the payment and adjustments, identifies any legitimate patient responsibility, and follows up if the claim was denied, underpaid, or otherwise unresolved.

This example demonstrates why effective claims processing depends on coordination across the entire revenue cycle rather than only the billing department.

Claim Submission Process at a Glance

Best Practices for Healthcare Providers

An effective medical claim workflow should make accuracy measurable.

Practices should consider tracking:

• Rejection trends
• Denial categories
• Days in accounts receivable
• Claims requiring manual correction
• Eligibility-related failures
• Authorization-related denials
• Coding-related denials
• Timely-filing issues
• Payer-specific recurring problems

The most valuable insights often come from connecting downstream claim problems with their upstream cause.

For example, a denial may appear to be a billing department problem, but the actual source could be registration, scheduling, authorization, provider documentation, coding, or payer enrollment.

That is why effective revenue cycle management treats claim submission as a cross-functional process.

Important Billing and Coding Considerations

There is no single coding or reimbursement rule that applies to every medical claim.

Claim requirements can depend on:

• Type of provider
• Site of service
• Payer
• Patient’s benefit plan
• Service performed
• Clinical documentation
• Medical necessity requirements
• Prior authorization requirements
• Applicable coding guidelines
• Provider contracts
• Federal or state program rules

Providers and billing teams should confirm current payer policies and authoritative coding guidance before making claim-specific decisions.

Frequently Asked Questions

What is claim submission in medical billing?

Claim submission is the process of preparing and transmitting a healthcare claim to an insurance payer for processing and reimbursement. It typically includes patient verification, documentation, coding, claim creation, validation, transmission, status monitoring, adjudication, and payment or denial follow-up.

What are the main steps in the medical claim process?

The main steps generally include patient registration, eligibility verification, authorization review, clinical documentation, coding, charge entry, claim creation, claim scrubbing, electronic submission, acknowledgment review, payer adjudication, remittance processing, payment posting, and follow-up.

What is an 837 claim?

The ASC X12N 837 is the HIPAA-adopted standard for electronic healthcare claim transactions. Variants are used for professional, institutional, and dental claims.

What is the difference between an 837P and an 837I claim?

The 837P is used for professional electronic claims, while the 837I is used for institutional electronic claims. The appropriate format depends on the provider and type of service being billed.

What happens after a medical claim is submitted?

The claim may first undergo technical and formatting edits. If accepted, it proceeds to payer adjudication, where applicable coverage, benefit, payment, coding, and policy rules are applied. The provider then receives claim disposition and remittance information.

What causes medical claims to be rejected?

Common causes include missing information, invalid patient or payer data, incorrect claim formatting, provider-data problems, and other submission errors. The specific reason should be reviewed before the claim is corrected and resubmitted.

Is a rejected claim the same as a denied claim?

No. A rejection often occurs before a claim completes adjudication because of data or submission problems. A denial generally occurs after the payer has evaluated the claim and determined that some or all of it is not payable under the applicable rules.

How can healthcare providers reduce claim submission errors?

Providers can reduce avoidable errors through accurate registration, eligibility verification, authorization checks, complete clinical documentation, current coding practices, pre-submission claim scrubbing, acknowledgment monitoring, and systematic analysis of rejection and denial patterns.