Accurate billing and coding is the financial engine of an optometry practice. Every service performed must be correctly documented, coded, and billed to ensure appropriate reimbursement. Billing errors—whether undercoding, overcoding, or claim denials—directly affect practice revenue and compliance risk. The CPO exam tests your knowledge of the billing workflow, claim submission, denial management, payment posting, and billing terminology.
The Complete Billing Workflow
Eligibility Verification
Before the appointment: confirm insurance coverage, copays, deductible status, and available benefits. Reduces claim denials due to eligibility issues.
N: 1
Patient Registration
Collect accurate patient demographics and insurance information at check-in. Photograph insurance cards. Verify ID.
N: 2
Encounter and Documentation
Provider performs and documents the exam. Clinical documentation supports the codes assigned—documentation must justify medical necessity.
N: 3
Charge Capture / Superbill
Assign CPT and ICD-10 codes. Complete the superbill. Ensure all procedures performed are captured—missed charges = lost revenue.
N: 4
Claim Creation
Enter charges in the practice management system (PMS). Verify patient, provider, and payer information are correct before submitting.
N: 5
Claim Scrubbing
Use a clearinghouse to "scrub" claims for formatting errors and common denial triggers before submitting to the payer. Reduces initial denial rate.
N: 6
Claim Submission
Submit electronically (preferred—faster and trackable) or by paper. Confirm the payer received the claim (check clearinghouse acknowledgment).
N: 7
Payment Posting / EOB Review
Receive ERA/EOB. Post payments. Flag underpayments and denials for follow-up. Verify contractual adjustments match fee schedule.
N: 8
Denial Management
Identify denial reason codes. Correct errors and refile, or appeal with supporting documentation. Track denial rates and common causes.
N: 9
Patient Billing
After insurance processes, bill patient for remaining balance (copay, deductible, non-covered services). Send statements on a clear schedule.
N: 10
Key Billing Terminology
- Allowed Amount — The maximum amount an insurer agrees to pay for a service under the provider contract.
- Contractual Adjustment — The difference between the billed charge and the allowed amount; written off by in-network providers.
- Copay — Fixed amount the patient pays per visit regardless of the total charge.
- Deductible — Amount the patient must pay out-of-pocket before insurance begins paying (except copay services).
- Coinsurance — After the deductible, the percentage split between patient and insurer (e.g., 80/20 means insurer pays 80%, patient pays 20%).
- EOB / ERA — Explanation of Benefits (paper) or Electronic Remittance Advice (electronic)—payer's response to a claim.
- Prior Authorization (PA) — Pre-approval required from the insurer before certain services are performed.
- ABN — Advance Beneficiary Notice—required for Medicare patients before providing a service Medicare may not cover; allows balance billing.
- Clearinghouse — Intermediary that processes and transmits electronic claims between providers and payers.
- Timely Filing — The deadline for submitting a claim to the payer after the date of service.
- Write-off — Amount removed from patient balance that cannot be collected (contractual adjustment, bad debt, etc.).
- Accounts Receivable (A/R) — Total money owed to the practice; tracked by payer and age (30/60/90+ days).
Common Denials & Resolution
- Patient not eligible — Verify eligibility again; check dates; may need to bill patient directly if truly no coverage at time of service.
- Duplicate claim — Confirm the original was not paid; if separate service, add appropriate modifier (-76, -77) and resubmit.
- Medical necessity not established — Review documentation; add more specific/appropriate ICD-10 diagnosis code; appeal with supporting clinical notes.
- Prior authorization required — Obtain retroactive authorization if payer allows; appeal with clinical justification; write off if authorization cannot be obtained.
- Timely filing exceeded — Rarely appealable; review internal submission workflows to prevent recurrence; may be able to recover from secondary insurance.
- Non-covered service — Verify benefit coverage; if patient was not informed, may need to write off; if patient was informed in advance (ABN for Medicare), patient may be billed.