The medical billing process is the series of administrative and financial steps that connects a healthcare service with payment from an insurance company or patient. It begins with collecting patient and insurance information and continues through coding, claim submission, payer processing, payment posting, and follow-up on unpaid or denied claims.

For a medical practice, understanding the healthcare billing process is important because even a correctly documented service can experience payment delays when information is incomplete, coding does not accurately represent the service, or a claim is submitted incorrectly.

While workflows vary by practice, specialty, payer, and type of service, the basic billing cycle follows a recognizable sequence:

Patient registration → Eligibility verification → Documentation → Coding → Charge entry → Claim creation → Claim submission → Payer adjudication → Payment posting → Denial management → Patient billing → Account follow-up

Let’s look at each stage in detail.

What Is the Medical Billing Process?

The medical billing process is the workflow used by healthcare organizations to submit requests for payment for covered healthcare services and manage the financial transactions that follow.

A claim is essentially a request for payment for healthcare services provided to a patient. In the Medicare environment, claims can be submitted electronically using standardized transactions, with professional and institutional services using different claim formats.

Medical billing is closely connected to medical coding, but the two functions are not identical.

• Medical coding translates documented diagnoses, procedures, and services into standardized codes.
• Medical billing uses that information, along with patient, provider, payer, and financial details, to create and manage claims and payments.

Together, these activities support the broader revenue cycle of a healthcare organization.

Medical Billing Process: Step-by-Step

Step 1: Patient Registration and Information Collection

The billing process begins before the claim is created.

During registration, the healthcare organization collects information such as:

• Patient name and date of birth
• Address and contact information
• Insurance information
• Member or policy identification numbers
• Subscriber information
• Referring provider information when applicable
• Relevant consent and financial information

Accurate demographic and insurance information is important because incorrect information can create problems later in the billing cycle.

For example, an incorrect member ID or payer selection may prevent a claim from being processed correctly.

Step 2: Insurance Eligibility and Benefits Verification

After collecting insurance information, the practice may verify whether the patient’s coverage is active and determine what benefits may apply to the planned service.

Eligibility verification can help the organization identify information such as:

• Whether coverage is active
• The applicable insurance plan
• Copayment requirements
• Deductible information
• Coinsurance
• Referral or authorization requirements, when applicable
• Potential patient financial responsibility

Electronic eligibility transactions are part of the standardized healthcare administrative transactions covered by HIPAA and related operating rules.

Verification does not guarantee that a particular service will ultimately be paid. Final payment can depend on claim details, coverage rules, medical policies, contractual requirements, and other factors.

Step 3: Patient Receives Healthcare Services

The patient then receives the scheduled healthcare service. The provider documents the encounter in the medical record. Documentation can include the reason for the visit, findings, diagnoses, procedures performed, services provided, and other information relevant to the patient’s care and billing.

Accurate documentation is important because coding and billing should reflect the services actually documented.

Step 4: Medical Coding

Once the encounter is documented, appropriate coding is assigned.

Medical coders review clinical documentation and translate relevant diagnoses, procedures, and services into standardized codes.

Depending on the service and setting, coding may involve systems such as:

• ICD-10-CM for diagnoses
• CPT for many professional procedures and services
• HCPCS Level II for certain services, supplies, and products

The exact coding requirements depend on the type of claim, payer, healthcare setting, and service.

Coding accuracy matters because the codes help communicate what was diagnosed and what services were performed.

Step 5: Charge Entry

After coding, charges are entered into the practice management or billing system.

Charge entry generally brings together information such as:

• Patient information
• Provider information
• Date of service
• Procedure codes
• Diagnosis codes
• Units or quantities
• Charges
• Modifiers when appropriate
• Insurance information

The resulting account information becomes the basis for creating the claim.

Step 6: Claim Creation and Scrubbing

The billing system generates a claim using the information collected during registration, documentation, coding, and charge entry.

Before claim submission, many practices use a claim-scrubbing process to identify potential errors.

A billing system or clearinghouse may check for issues such as:

• Missing required information
• Invalid or incomplete identifiers
• Coding inconsistencies
• Incorrect payer information
• Formatting problems
• Other claim-level errors

The purpose is to identify correctable issues before the claim reaches the payer.

For electronic Medicare claims, CMS describes multiple levels of edits. Claims that fail initial requirements may be rejected for correction and resubmission, while later edits can identify issues involving coverage and payment policies.

Step 7: Claim Submission

After the claim passes internal checks, it is submitted to the appropriate payer.

Electronic submission is widely used in healthcare billing. A claim may be transmitted directly to a payer or through a clearinghouse or billing service, depending on the organization’s workflow.

CMS explains that electronic health information can be exchanged between providers, clearinghouses, billing services, and payers using standardized electronic transactions.

For Medicare, professional claims can be submitted electronically using the applicable HIPAA-standard transaction, while institutional claims use a different transaction format.

At this stage, it is important to distinguish between a claim rejection and a claim denial.

Claim Rejection vs. Claim Denial

A rejection generally means the claim did not pass an initial processing or formatting requirement and needs correction before it can move through the payer’s adjudication process.

A denial occurs when the payer processes the claim but determines that payment, in whole or in part, will not be made under the applicable rules.

CMS describes electronic claim processing as involving initial edits followed by additional review for compliance with coverage and payment policies.

This distinction matters because the appropriate follow-up can differ.

Step 8: Payer Adjudication

After receiving a claim, the payer processes it through adjudication.

During adjudication, the payer evaluates the claim according to applicable requirements. Depending on the payer and claim, this can involve reviewing:

• Patient eligibility
• Coverage
• Contractual terms
• Coding
• Claim information
• Medical policies
• Deductible and coinsurance requirements
• Other payment rules

The payer may then:

• Pay the claim
• Partially pay the claim
• Deny the claim
• Request additional information
• Reject the claim for correction

The outcome is communicated through the payer’s payment or remittance information.

Step 9: Payment and Remittance Advice

After adjudication, the payer sends payment and/or remittance information to the healthcare provider.

An Electronic Remittance Advice (ERA) explains how a health plan processed the claim and how charges were adjusted. CMS notes that remittance advice can report payment amounts, adjustments, and the reasons for those adjustments.

Adjustments can involve amounts assigned to:

• The provider
• The patient
• Contractual obligations
• Other financial categories

The remittance information helps the billing team understand exactly what happened to each claim line.

What Is an ERA?

An ERA is an electronic explanation from a health plan describing claim payment and adjustments.

CMS notes that standardized adjustment codes, including Claim Adjustment Reason Codes (CARCs) and Remittance Advice Remark Codes (RARCs), are used to explain adjustments.

This information is important for accurate payment posting and follow-up.

Step 10: Payment Posting

Once the practice receives payment and remittance information, the billing team posts the payment to the patient’s account.

Payment posting typically involves comparing:

• Amount billed
• Amount allowed
• Amount paid
• Contractual adjustments
• Patient responsibility
• Remaining balance
• Denied or unpaid amounts

Electronic remittance information can help automate or simplify this process by allowing payment and adjustment information to be transferred into billing or accounting systems.

Accurate payment posting helps ensure that accounts reflect the payer’s actual adjudication.

Step 11: Denial Management and Claim Follow-Up

Not every claim is paid on the first submission.

When a claim is denied or otherwise requires follow-up, billing staff review the payer’s response to determine why.

Common areas reviewed include:

• Eligibility
• Missing information
• Coding
• Authorization requirements
• Coverage rules
• Timely filing
• Documentation
• Coordination of benefits
• Contractual issues

The next action depends on the reason for the unpaid claim.

Possible actions may include:

• Correcting and resubmitting a claim
• Providing additional documentation
• Contacting the payer
• Filing an appeal when appropriate
• Reviewing contractual requirements
• Adjusting the account when the balance is not collectible from the payer

CMS provides formal appeal processes for certain Medicare claim decisions, illustrating that a denied claim is not necessarily the end of the billing workflow.

Step 12: Patient Billing and Collections

After insurance processing is complete, any remaining legitimate patient responsibility may be billed according to the provider’s policies and applicable payer requirements.

Patient responsibility can include amounts such as:

• Copayments
• Deductibles
• Coinsurance
• Other amounts assigned to the patient under the applicable coverage arrangement

The billing office may send a statement explaining the balance and available payment methods.

Clear patient statements can make it easier for patients to understand why a balance remains after insurance has processed a claim.

Step 13: Account Reconciliation and Reporting

The billing cycle does not end simply because a payment was received.

Healthcare organizations may reconcile payments, accounts receivable, adjustments, and outstanding balances to ensure that financial records accurately reflect activity.

Billing reports can help organizations monitor areas such as:

• Outstanding accounts receivable
• Aging balances
• Claim status
• Denials
• Payment trends
• Patient balances
• Unresolved accounts

These reports can help billing teams identify recurring workflow problems and areas requiring attention.

Medical Billing Process at a Glance

Step	Main Activity	Purpose
1	Patient registration	Collect accurate patient and insurance information
2	Eligibility verification	Confirm coverage and identify benefit information
3	Clinical documentation	Record the services and diagnoses
4	Medical coding	Translate documentation into standardized codes
5	Charge entry	Enter services and charges into the billing system
6	Claim scrubbing	Identify potential errors before submission
7	Claim submission	Send the claim to the appropriate payer
8	Adjudication	Payer reviews and determines claim payment
9	Remittance	Payer communicates payment and adjustments
10	Payment posting	Record payments and adjustments
11	Denial management	Resolve unpaid or denied claims
12	Patient billing	Bill remaining patient responsibility
13	Reconciliation	Review accounts and financial records

Why an Efficient Billing Cycle Matters

A well-organized billing cycle can help a healthcare organization maintain accurate financial records and manage claims more systematically.

Problems at one stage can affect later stages.

For example, incorrect patient information can cause claim problems. Coding discrepancies can affect claim processing. Missing documentation may require additional payer review. Incorrect payment posting can leave account balances inaccurate.

For this reason, medical billing is not simply about sending invoices. It is a connected workflow in which registration, documentation, coding, claims, payer processing, payment posting, and follow-up all influence one another.

Common Medical Billing Challenges

Healthcare organizations may encounter several challenges during the billing process, including:

Inaccurate Patient Information

Incorrect demographic or insurance details can interfere with claim processing and eligibility verification.

Coding Errors

Coding that does not accurately reflect documentation can create claim-processing issues or payment problems.

Claim Rejections

Technical or data-related errors may cause claims to be rejected before full adjudication.

Claim Denials

A claim can be denied after payer review for reasons related to coverage, authorization, documentation, coding, or other requirements.

Delayed Follow-Up

Unresolved claims can remain outstanding when accounts are not monitored consistently.

Complex Payer Rules

Different insurers and plans can have different requirements, making payer-specific knowledge important.

How Technology Supports Medical Billing

Modern billing operations often rely on practice-management systems, electronic claims, clearinghouses, eligibility transactions, electronic remittance advice, and electronic funds transfer. CMS describes electronic data interchange as the automated transfer of healthcare administrative information using defined formats and data rules.

Electronic systems can help reduce manual work, identify certain errors, organize claim status information, and support payment posting. However, technology does not eliminate the need for accurate documentation, coding knowledge, payer-specific review, and appropriate human oversight.

Frequently Asked Questions

1. What is the medical billing process?

The medical billing process is the workflow used to turn documented healthcare services into claims, submit those claims to payers, process payments and adjustments, manage denials, and resolve remaining patient balances.

2. What is the difference between medical billing and medical coding?

Medical coding converts clinical documentation into standardized diagnosis and procedure codes. Medical billing uses those codes and other information to create claims, submit them to payers, manage payments, and follow up on unpaid balances.

3. What happens after claim submission?

The payer processes the claim through its applicable edits and adjudication rules. The claim may be paid, partially paid, denied, rejected, or require additional information. The provider receives payment and/or remittance information describing the outcome.

4. What is claim scrubbing?

Claim scrubbing is the process of checking a claim for potential errors or missing information before submission. The goal is to identify correctable problems before the claim reaches the payer.

5. What is a medical billing denial?

A denial occurs when a payer processes a claim or claim line but does not approve payment under the applicable rules. The billing team generally reviews the denial reason and determines whether correction, resubmission, additional documentation, or an appeal is appropriate.

6. What is an ERA in medical billing?

ERA stands for Electronic Remittance Advice. It is an electronic explanation from a health plan showing claim payment information and adjustments. CMS notes that ERAs use standardized adjustment codes to communicate reasons for payment changes.

7. How long does the medical billing process take?

There is no single timeframe for every claim. Processing can vary according to the payer, claim type, submission method, complexity, documentation requirements, and whether the claim requires correction or additional review. Practices should monitor payer-specific requirements and claim status throughout the billing cycle.

Conclusion

The medical billing process is a connected workflow that begins with accurate patient registration and continues through eligibility verification, documentation, coding, charge entry, claim submission, payer adjudication, payment posting, denial management, and patient billing. Understanding each stage helps healthcare organizations identify where delays, errors, or unresolved claims may occur. A strong healthcare billing process depends on accurate information, appropriate coding, timely claims, careful review of payer responses, and consistent follow-up.

Ultimately, the billing cycle works best when every stage is treated as part of the same process rather than as an isolated administrative task.