The medical billing process is a 10-step sequence that moves a patient encounter from registration to reimbursement. In behavioral health, each step carries additional complexity from time-based coding, prior authorization timelines, and payer-specific rules. Here is what this guide covers:
- Patient registration and insurance verification
- Eligibility and benefits check
- Medical coding (ICD-10, CPT, HCPCS)
- Charge entry and claim creation
- Claim scrubbing and submission
- Payment posting and ERA reconciliation
- Denial management
- Appeals
- Patient billing and collections
- Reporting and revenue cycle analysis
The medical billing process is the sequence of steps that moves a patient encounter from registration to reimbursement. Every step depends on the one before it. When one breaks down, the entire revenue cycle slows, claims get denied, and cash flow suffers. For behavioral health providers, where prior authorization timelines and time-based coding add layers of complexity, understanding each step is operational knowledge, not optional background reading.
Here are the 10 steps that make up the medical billing process and where each one tends to break in behavioral health settings.
| Step | Action | BH-Specific Risk |
|---|---|---|
| 1. Registration | Collect demographics and insurance | Missing carve-out plan identification |
| 2. Eligibility | Verify coverage, benefits, auth requirements | Visit limits, MHPAEA parity gaps |
| 3. Coding | Assign ICD-10, CPT, HCPCS codes | Time-based code mismatches (90832/34/37) |
| 4. Charge entry | Build claim with codes and auth numbers | Authorization window misalignment |
| 5. Scrubbing | Check for errors before submission | Missing auth numbers, session time conflicts |
| 6. Payment posting | Post ERA payments, reconcile | Underpayments on varying BH contract rates |
| 7. Denials | Investigate, correct, resubmit | Medical necessity disputes, auth lapses |
| 8. Appeals | File appeals with supporting documentation | Payer-specific formats, 30-day deadlines |
| 9. Patient billing | Bill remaining patient responsibility | 42 CFR Part 2 confidentiality compliance |
| 10. Reporting | Track AR, denial rates, collection % | Authorization utilization, payer mix shifts |
Step 1: Patient Registration and Insurance Verification
The billing process starts the moment a patient schedules an appointment. Front desk staff collect demographic information, insurance details, and a copy of the insurance card. This information feeds directly into the claim. Errors at this stage, such as a misspelled name, a transposed policy number, or an outdated insurance card, result in rejected claims weeks later.
In behavioral health, registration also includes capturing referral source data, confirming whether the patient has a behavioral health carve-out plan, and identifying the managed behavioral health organization (MBHO) that manages their mental health benefits. Skipping this step means billing the wrong entity entirely.
Step 2: Eligibility and Benefits Check
Before any service is provided, the billing team verifies the patient’s insurance eligibility and confirms active coverage for the specific services being offered. This step goes beyond confirming that a policy is active. It means checking deductible status, copay and coinsurance amounts, out-of-pocket maximums, and whether the plan requires prior authorization for the services being scheduled.
For behavioral health clinics, the eligibility check also needs to confirm visit limits (many plans cap the number of therapy sessions per year), whether the provider is in-network with the patient’s specific plan, and whether substance use disorder services are covered under the same terms as medical benefits per MHPAEA requirements.
Step 3: Medical Coding (ICD-10, CPT, HCPCS)
After a clinical encounter, a medical coder reviews the provider’s documentation and assigns standardized codes that describe the diagnosis and the services provided. Three primary code sets are used: ICD-10-CM for diagnoses, CPT for procedures, and HCPCS Level II for services and supplies not covered by CPT.
Behavioral health coding carries specific risks. Therapy session codes (90832, 90834, 90837) are time-based, meaning the documented session duration must match the code billed. Psychiatric evaluation codes (90791, 90792) and psychotherapy add-on codes (90833, 90836, 90838) each have strict usage rules. Selecting the wrong code based on a documentation discrepancy is one of the most common denial triggers in behavioral health billing.
Step 4: Charge Entry and Claim Creation
Once codes are assigned, the billing team enters the charges into the practice management system and builds the claim. Each claim includes the patient’s demographic and insurance information, the provider’s NPI number, the date of service, the diagnosis codes, the procedure codes, and the billed amount for each service.
In behavioral health, charge entry also requires matching the authorization number to the correct date of service. Residential and intensive outpatient programs that bill daily or per-session need to track authorizations at the line-item level to prevent submitting charges for dates that fall outside the approved authorization window.
Step 5: Claim Scrubbing and Submission
Before a claim goes to the payer, it passes through a claim scrubbing process that checks for common errors: missing fields, invalid code combinations, duplicate charges, and formatting issues. Claims that pass scrubbing are submitted electronically to the payer through a clearinghouse.
Clean claim rates matter. Industry benchmarks target a first-pass clean claim rate above 95 percent. Every claim that gets rejected at the clearinghouse level or denied by the payer on first submission adds days to the reimbursement timeline and costs the practice money in rework. Behavioral health claims are particularly vulnerable to scrubbing failures when authorization numbers are missing or when time-based codes don’t align with the documented session length.
Step 6: Payment Posting and ERA Reconciliation
When a payer processes a claim, they send back an Electronic Remittance Advice (ERA) that shows what was paid, what was adjusted, and what was denied. The billing team posts these payments to the patient’s account and reconciles the ERA against the original claim to identify any discrepancies.
This step is where underpayments get caught or missed. If a payer reimburses less than the contracted rate and the billing team doesn’t flag it during posting, that revenue is lost. For behavioral health providers with multiple payer contracts and varying reimbursement rates by service type, careful ERA reconciliation is one of the most important but least visible parts of the billing process.
Step 7: Denial Management
Not every claim gets paid on first submission. Denied claims require investigation to determine the reason for denial, correction of the underlying issue, and resubmission or appeal. Common denial reasons in behavioral health include missing or expired prior authorization, documentation that doesn’t meet the payer’s medical necessity criteria, and coding errors related to session duration or provider credentialing status.
Effective denial management requires tracking denial patterns by payer, reason code, and service type. Clinics that treat denials as one-off problems rather than systemic patterns will keep losing the same revenue repeatedly.
Step 8: Appeals
When a denied claim has been correctly billed and the denial is unjustified, the billing team files an appeal with supporting documentation. Appeals in behavioral health often involve medical necessity disputes where the payer determined that the level of care provided was not clinically justified based on their review criteria.
Successful appeals require payer-specific knowledge. Each insurance company has its own appeal submission format, documentation requirements, and filing deadlines. Missing an appeal deadline, which can be as short as 30 days from the date of the denial notice, means the revenue is gone permanently.
Step 9: Patient Billing and Collections
After insurance has paid its portion, any remaining patient responsibility (deductible, copay, coinsurance) is billed to the patient. Patient statements need to clearly show what insurance paid, what the patient owes, and why. Confusing or delayed patient statements reduce collection rates.
In behavioral health, patient billing sensitivity is higher than in general medical settings. Billing communications need to be clear and professional while complying with 42 CFR Part 2 confidentiality requirements for substance use disorder records. A billing statement that inadvertently discloses the nature of SUD treatment to a household member can create both a compliance violation and a trust issue with the patient.
Step 10: Reporting and Revenue Cycle Analysis
The final step in the medical billing process is ongoing reporting and analysis. Key metrics include days in accounts receivable (AR), clean claim rate, denial rate by payer, collection rate, and net collection percentage. These numbers tell a practice whether its billing process is working or leaking revenue.
For behavioral health clinics, reporting should also track authorization utilization rates (how many authorized sessions are actually being billed), payer mix trends, and reimbursement rate changes over time. A clinic that only looks at total collections without understanding the underlying metrics is operating without visibility into its own financial health.
How CodeMax Optimizes the Billing Process for Behavioral Health
Each step in the medical billing process creates an opportunity for revenue to leak or for operations to slow down. In behavioral health, where authorization timelines are tighter, coding rules are time-based, and payer variability is higher than in general medical billing, the margin for error across all 10 steps is smaller.
A well-managed billing process reduces denials, accelerates reimbursement timelines, improves clean claim rates, and gives clinic operators real visibility into their financial position. It means fewer hours spent chasing rejected claims, less revenue written off to missed deadlines, and a more predictable cash flow month over month.
CodeMax manages every step of the behavioral health billing process, from eligibility verification through denial management and reporting. With 20 years of experience in behavioral health RCM and proprietary systems built specifically for mental health and substance use disorder providers, CodeMax handles the billing complexity so clinic operators can focus on running their programs.
See what a fully managed billing process looks like for your practice. Talk to a CodeMax billing specialist today.
Frequently Asked Questions
The medical billing process is the series of steps healthcare providers follow to submit claims to insurance companies and collect payment for services. It includes patient registration, insurance verification, coding, claim submission, payment posting, denial management, and patient billing.
The 10 steps are patient registration, eligibility verification, medical coding, charge entry, claim scrubbing, claim submission, payment posting, denial management, appeals, and patient billing with collections. Each step depends on accuracy in the step before it.
Clean claims are typically processed within 30 days. However, denied or rejected claims can extend the timeline to 60, 90, or 120+ days depending on the payer, the denial reason, and how quickly the billing team responds with corrections or appeals.
The billing cycle directly controls cash flow. A well-managed cycle reduces denials, accelerates reimbursement, and gives providers financial visibility. A broken cycle leads to stacking AR, lost revenue from missed appeal deadlines, and unpredictable cash flow that threatens operations.
Medical coding converts clinical documentation into standardized codes (ICD-10, CPT, HCPCS). Medical billing uses those codes to build, submit, and follow up on insurance claims. Coding happens before billing. If the codes are wrong, the claim is wrong.
