The medical billing process converts patient care into a claim, sends that claim to an insurance payer, records the payer’s decision, posts payment, bills the patient when needed, and follows up until the account is resolved.
This process starts before the patient visit and ends after the provider receives the correct reimbursement. It connects patient registration, insurance verification, medical coding, claim scrubbing, claim submission, payer adjudication, payment posting, denial management, patient collections, and AR follow-up.
For healthcare providers, the medical billing cycle controls cash flow. A small error in demographics, eligibility, coding, modifiers, prior authorization, or payer rules can delay payment or create a denial.
This guide explains the step-by-step medical billing process, the full claims lifecycle, and the payer flow behind accurate reimbursement.
What Is the Medical Billing Process?
The medical billing process is the administrative and financial workflow used to bill payers and patients for healthcare services.
It includes every step from patient intake to final payment resolution. The process is also part of the larger revenue cycle management process, which manages the financial journey of a patient account from scheduling to collections.
A medical billing workflow includes 4 main parties:
| Party | Role in the Billing Process |
| Patient | Provides demographic, insurance, and payment information |
| Provider | Documents diagnosis, treatment, and medical necessity |
| Payer | Reviews the claim and decides payment, denial, rejection, or adjustment |
| Billing Team | Creates, submits, tracks, posts, and follows up on claims |
What Are the Main Medical Billing Process Steps?
The medical billing process has 12 main steps: registration, insurance verification, documentation, coding, charge entry, claim scrubbing, claim submission, payer adjudication, payment posting, denial management, patient billing, and AR follow-up.
| Step | Billing Stage | Main Goal |
| 1 | Patient Registration | Capture correct patient and insurance data |
| 2 | Insurance Verification | Confirm active coverage and benefits |
| 3 | Encounter Documentation | Record medical necessity and services |
| 4 | Medical Coding | Convert documentation into billable codes |
| 5 | Charge Entry | Add charges, units, modifiers, and provider data |
| 6 | Claim Scrubbing | Find errors before claim submission |
| 7 | Claim Submission | Send the claim to the payer |
| 8 | Payer Adjudication | Receive payer decision |
| 9 | Payment Posting | Record payment, adjustment, denial, or balance |
| 10 | Denial Management | Correct, appeal, and prevent denied claims |
| 11 | Patient Billing | Bill the remaining patient balance |
| 12 | AR Follow-Up | Resolve unpaid, delayed, or underpaid claims |
Step 1. How Does Patient Registration Start the Medical Billing Cycle?
Patient registration starts the medical billing cycle by collecting the data required to create a claim.
The front desk or intake team records the patient’s full name, date of birth, address, phone number, insurance carrier, member ID, group number, policyholder details, and secondary insurance information.
Incorrect registration data can cause claim rejections. Common errors include wrong date of birth, misspelled name, inactive policy number, missing subscriber details, and incorrect coordination of benefits.
Step 2. Why Is Insurance Verification Important in Medical Billing?
Insurance verification in medical billing confirms active coverage, benefits, copay, deductible, coinsurance, referral rules, and prior authorization requirements.
This step protects the claim before care is billed. A payer may deny a claim when the patient’s policy is inactive, the service needs prior authorization, or the provider is out of network.
Insurance verification also improves patient collections because patients understand their expected responsibility before the visit.
Step 3. How Is the Patient Encounter Documented?
The patient encounter is documented by recording the diagnosis, treatment, procedure, medical necessity, provider notes, and services performed.
Documentation supports code selection and claim payment. Strong documentation explains what happened, why the service was medically necessary, and which services were provided.
Incomplete documentation can create coding delays, undercoding, overcoding, payer audits, and denials.
Step 4. How Does Medical Coding in Billing Work?
Medical coding in billing converts provider documentation into standardized diagnosis, procedure, supply, and service codes.
Medical coders use:
| Code Type | Purpose |
| ICD-10-CM | Reports diagnoses and medical necessity |
| CPT | Reports professional procedures and services |
| HCPCS Level II | Reports supplies, equipment, drugs, and some non-physician services |
| Modifiers | Add details about service location, laterality, repeat procedures, or special billing conditions |
CMS lists ICD-10, HCPCS, CPT, CDT, and NDC as HIPAA code sets used for healthcare transactions.
Correct coding supports clean claims. Incorrect coding can cause denials, reduced payment, underpayment, payer recoupments, and compliance risk.
Step 5. What Happens During Charge Entry?
Charge entry adds coded services, fees, provider details, place of service, units, modifiers, and payer information into the billing system.
This step creates the claim from documentation and coding data. The biller checks the fee schedule, provider NPI, facility details, diagnosis pointers, authorization number, and service date.
Charge entry errors affect payment. A missing modifier can reduce reimbursement. A wrong place-of-service code can change payer pricing. A missing authorization number can trigger a denial.
Step 6. What Is Claim Scrubbing in Medical Billing?
Claim scrubbing in medical billing checks claims for errors before submission to improve the clean claim rate.
A claim scrubber reviews patient data, payer rules, coding logic, modifier use, NPI details, diagnosis pointers, authorization information, and required fields.
The goal is a clean claim. A clean claim is complete, accurate, and ready for payer processing without avoidable defects.
Claim scrubbing catches errors such as invalid member ID, missing diagnosis code, invalid NPI, duplicate claim, incorrect CPT-modifier combination, missing place of service, and payer-specific formatting issues.
Step 7. What Is the Claim Submission Process in Medical Billing?
The claim submission process in medical billing sends the completed claim to the payer through a clearinghouse, payer portal, or billing system.
Professional claims are commonly submitted using CMS-1500 format or electronic 837P transactions. Institutional claims are commonly submitted using UB-04/CMS-1450 format or electronic 837I transactions.
CMS explains that electronic claim submission can be completed through Medicare contractors, direct data entry, billing software, billing services, or clearinghouses that meet HIPAA claim standards.
A clearinghouse checks the claim, validates formatting, applies payer edits, and routes the claim to the correct payer.
Step 8. What Happens During Payer Adjudication?
Payer adjudication is the payer’s review process that decides whether a claim is paid, denied, rejected, adjusted, or pended.
The payer checks eligibility, covered benefits, medical necessity, coding accuracy, provider contract terms, authorization requirements, duplicate claim history, and coordination of benefits.
| Payer Outcome | Meaning |
| Paid | The payer approves reimbursement |
| Denied | The payer processes the claim but refuses payment |
| Rejected | The claim has an error and cannot be processed |
| Adjusted | The payer changes the allowed amount |
| Pended | The payer needs more review or documentation |
This stage controls the next action: payment posting, appeal, corrected claim, secondary billing, or patient balance transfer.
Step 9. How Does Payment Posting in Medical Billing Work?
Payment posting in medical billing records payer payments, contractual adjustments, denials, remark codes, and patient responsibility in the billing system.
Payment posting uses ERA, EOB, and 835 transaction data. CMS states that ERA data can be automatically posted to billing or accounting systems and may contain detailed payment and adjustment information.
A payment poster records:
- Insurance payment
- Contractual adjustment
- Denial code
- Remark code
- Copay
- Deductible
- Coinsurance
- Patient balance
- Underpayment
- Secondary payer balance
Accurate payment posting helps the AR team find underpayments, patient balances, denial trends, and appeal opportunities.
Step 10. How Does Denial Management in Medical Billing Work?
Denial management in medical billing identifies denied claims, finds the root cause, corrects the issue, submits appeals, and prevents repeat denials.
Common denial causes include inactive insurance, missing authorization, invalid coding, lack of medical necessity, timely filing, duplicate claim submission, non-covered services, missing modifiers, and incomplete documentation.
| Denial Category | Example |
| Eligibility Denial | Coverage inactive on service date |
| Authorization Denial | Prior authorization missing |
| Coding Denial | CPT and diagnosis mismatch |
| Medical Necessity Denial | Documentation does not support the service |
| Timely Filing Denial | Claim submitted after payer deadline |
| Duplicate Denial | Same claim submitted more than once |
Strong denial management tracks denial trends by payer, provider, CPT code, location, and denial reason.
Step 11. How Does Patient Collections in Medical Billing Work?
Patient collections in medical billing starts after insurance processes the claim and assigns a remaining balance to the patient.
Patient responsibility may include copay, deductible, coinsurance, self-pay balance, or non-covered service amount.
A strong patient billing process includes clear statements, online payments, payment reminders, payment plans, balance explanations, and documented collection policies.
Confusing statements create calls, disputes, delayed payments, and bad debt.
Step 12. How Does AR Follow-Up Complete the Medical Billing Workflow?
AR follow-up completes the medical billing workflow by resolving unpaid, delayed, denied, underpaid, and patient-responsibility balances.
The AR team reviews aging reports by 0–30, 31–60, 61–90, 91–120, and 120+ days.
Days in AR medical billing measures how long claims remain unpaid. Lower days in AR usually reflects faster claim submission, cleaner payer processing, stronger denial response, and better payment follow-up.
AR follow-up includes claim status checks, payer calls, corrected claims, appeals, medical record submission, underpayment review, secondary billing, and patient balance transfers.
What Is the Full Claims Lifecycle and Payer Flow?
The claims lifecycle moves from patient intake to claim creation, payer review, payment decision, posting, follow-up, and final account resolution.
A simple claim lifecycle looks like this:
Patient Registration → Insurance Verification → Provider Documentation → Medical Coding → Charge Entry → Claim Scrubbing → Clearinghouse → Payer Adjudication → ERA/EOB → Payment Posting → Denial or AR Follow-Up → Final Balance Resolution
Example:
A patient visits a primary care provider for hypertension follow-up. The provider documents the diagnosis and treatment. The coder assigns ICD-10-CM and CPT codes. The biller creates a professional claim and submits it electronically as an 837P transaction. The payer reviews the claim, sends payment and remittance information through an 835, and the payment poster records the payer payment, adjustment, and any patient deductible.
CMS-1500 vs UB-04: What Is the Difference?
CMS-1500 is used for professional claims, while UB-04, also called CMS-1450, is used for institutional claims.
| Form | Also Known As | Used By | Common Use |
| CMS-1500 | Professional claim form | Physicians, suppliers, non-institutional providers | Office visits, professional services, DME |
| UB-04 | CMS-1450 | Hospitals, facilities, institutional providers | Facility charges, inpatient and outpatient facility billing |
CMS identifies CMS-1450, also known as UB-04, as a form used by institutional providers when they qualify for a waiver from the ASCA electronic claim submission requirement.
What Is the Difference Between EDI 837 and 835?
EDI 837 submits healthcare claims to payers, while EDI 835 sends payment and remittance information back to providers.
| EDI Transaction | Purpose | Direction |
| 837P | Professional claim submission | Provider to payer |
| 837I | Institutional claim submission | Provider to payer |
| 835 | Payment and remittance advice | Payer to provider |
CMS defines EDI as the automated transfer of data in a specific format between a healthcare provider and Medicare, or between Medicare and another health plan. CMS also notes that EDI can involve clearinghouses or billing services.
HIPAA Administrative Simplification sets national standards for electronic transactions, code sets, unique identifiers, and operating rules.
What Is the Difference Between a Rejected Claim and a Denied Claim?
A rejected claim has not been processed because of an error, while a denied claim has been processed and refused for payment.
| Item | Rejected Claim | Denied Claim |
| Meaning | Claim cannot enter payer processing | Claim was reviewed and refused |
| Timing | Before full adjudication | After payer review |
| Common Cause | Missing data, invalid format, wrong ID | No authorization, non-covered service, medical necessity issue |
| Fix | Correct and resubmit | Appeal, correct, or provide documentation |
| Revenue Risk | Payment delay | Revenue loss if unresolved |
This distinction matters because rejected claims usually need correction, while denied claims often need appeal or documentation.
Which KPIs Measure the Medical Billing Process?
The main medical billing KPIs are clean claim rate, denial rate, days in AR, first-pass resolution rate, net collection rate, claim lag, and payment posting lag.
| KPI | What It Measures | Why It Matters |
| Clean Claim Rate | Claims accepted without preventable errors | Shows claim quality |
| Denial Rate | Claims denied by payers | Shows revenue leakage |
| Days in AR | Average time claims stay unpaid | Shows cash flow speed |
| First-Pass Resolution Rate | Claims paid after first submission | Shows workflow accuracy |
| Net Collection Rate | Collectable revenue actually collected | Shows collection performance |
| Claim Lag | Days between service and claim submission | Shows billing speed |
| Payment Posting Lag | Days between payment receipt and posting | Shows reconciliation speed |
These KPIs show where the revenue cycle management process is delayed, denied, underpaid, or leaking revenue.
In-House vs Outsourced Medical Billing: Which Model Fits Best?
In-house medical billing is managed by internal staff, while outsourced medical billing is handled by an external billing company or revenue cycle team.
| Model | Best Fit | Main Limitation |
| In-house billing | Practices that want full internal control | Higher staffing, training, software, and management cost |
| Outsourced billing | Practices needing billing, coding, denial, and AR expertise | Requires transparent reporting and communication |
| Hybrid billing | Practices keeping front-end tasks internal and outsourcing back-end work | Requires clear role separation |
A practice may consider outsourced billing when denials increase, days in AR rise, staffing becomes unstable, coding gets complex, or payer follow-up consumes too much internal time.
For practices that want billing support without expanding internal staff, Zeerak Care’s Medical Billing Services page is the best next internal link from this article.
How Can Providers Improve the Medical Billing Process?
Providers improve the medical billing process by verifying insurance before service, documenting care accurately, coding correctly, submitting clean claims, tracking denials, posting payments accurately, and reviewing AR reports.
Use this improvement checklist:
- Verify eligibility before every visit.
- Confirm prior authorization before treatment.
- Review documentation before coding.
- Use correct CPT, ICD-10-CM, HCPCS, and modifier codes.
- Scrub claims before submission.
- Track rejections separately from denials.
- Work denials by root cause.
- Post payments from ERA and EOB data accurately.
- Monitor days in AR weekly.
- Review payer trends monthly.
This process improves claim accuracy, reduces preventable denials, and supports predictable provider cash flow.
FAQs About the Medical Billing Process
What is the medical billing process?
The medical billing process is the workflow used to submit healthcare claims, collect payer reimbursement, bill patients, and resolve unpaid balances.
How does medical billing work?
Medical billing works by converting patient care into codes, placing those codes on a claim, submitting the claim to a payer, and collecting payment after payer review.
What are the main medical billing process steps?
The main steps are registration, insurance verification, documentation, coding, charge entry, claim scrubbing, claim submission, payer adjudication, payment posting, denial management, patient billing, and AR follow-up.
What is payer adjudication?
Payer adjudication is the payer’s review of a claim to decide payment, denial, rejection, adjustment, or pending status.
What is payment posting in medical billing?
Payment posting records payer payments, contractual adjustments, denials, remark codes, and patient balances in the billing system.
What are days in AR in medical billing?
Days in AR measures the average number of days a provider’s claims remain unpaid.
What is a clean claim rate?
Clean claim rate measures the percentage of claims accepted without preventable errors on first submission.
Conclusion
The medical billing process works step by step through patient registration, insurance verification, documentation, medical coding, charge entry, claim scrubbing, claim submission, payer adjudication, payment posting, denial management, patient billing, and AR follow-up.
Each step affects clean claim rate, denial rate, days in AR, patient collections, and provider revenue. A strong medical billing workflow does more than submit claims. It manages the full claims lifecycle from patient intake to final reimbursement.
Healthcare providers improve billing performance when front-end data is accurate, coding is compliant, claims are clean, denials are tracked, payments are posted correctly, and AR follow-up is consistent.
Need help reducing denials, improving clean claim rate, and lowering days in AR? Explore Zeerak Care Medical Billing Services to see how expert billing support can strengthen your revenue cycle.