Claims Processing

Claims Processing as the Revenue Foundation

Claims processing is the administrative backbone of medical practice revenue. It involves the submission of a request for payment (claim) to a health insurance payer after a patient receives a medical service. For Medical Assistants (MAs), understanding this workflow is critical because claim accuracy directly impacts reimbursement timelines, reduces audit risk, and maintains practice financial health. On certification exams, expect questions on the sequence of steps, common errors, and the role of electronic data interchange (EDI).^[1]

Essential Claim Processing Vocabulary

• Claim: A formal request for payment containing patient demographics, provider information, diagnosis codes (ICD-10-CM), procedure codes (CPT/HCPCS), and charges.
• Clearinghouse: An intermediary that reformats claims from practice software into payer-acceptable electronic formats and performs editing checks.
• Electronic Remittance Advice (ERA): An electronic explanation of payments, denials, and adjustments sent by the payer.
• Explanation of Benefits (EOB): A paper version of the ERA provided to the patient and often to the provider.
• Encounter Form (Superbill): A document used during the patient visit that lists common diagnoses and procedures; it serves as the source document for claim creation.
• Coordination of Benefits (COB): The process of determining which payer is primary when a patient has multiple insurance policies.
• Adjudication: The payer’s process of reviewing a claim to determine payment amount, denial, or request for additional information.

The Standard Claims Submission Workflow

The Claims Processing Workflow

The following numbered sequence outlines the standard steps from patient check-in to final payment posting.^[2]

1. Collect Accurate Patient Information: Verify insurance ID, group number, effective dates, and copay/coinsurance requirements at each visit. Use electronic eligibility verification tools when available.
2. Document the Encounter: The provider documents the diagnosis (ICD-10-CM) and procedures performed. The MA (or coder) translates this into standard codes on the superbill or EHR.
3. Generate the Claim: Using practice management software, the MA enters charges, attaches the correct modifiers (e.g., -25, -59), and prepares the claim format (CMS-1500 for professional claims; UB-04 for institutional).
4. Claim Scrubbing (Pre-submission Edits): The claim is run through a software edit check (scrubber) to catch errors such as missing modifiers, invalid ICD-10 codes, or duplicate services. Many practices use a clearinghouse for this step.
5. Submit the Claim: If accepted by the scrubber, the claim is sent electronically (most common) or via paper to the payer’s address. Electronic claims are typically submitted within 48 hours; paper claims may take longer.
6. Payer Adjudication: The payer processes the claim, applies deductible/coinsurance, and determines payment. Statuses include: paid, denied, or pending (request for medical records).
7. Receive Payment and Remittance Advice: Payment (EFT check or electronic transfer) arrives with an ERA or EOB. The MA (or billing specialist) reviews the ERA for accuracy.
8. Post Payments and Adjustments: The payment and any contractual adjustments are posted to the patient account in the practice management system. Denied codes are noted for appeal or write-off.
9. Follow Up on Denials and Unpaid Claims: Using an aging report, the MA works outstanding claims systematically—calling the payer, resubmitting corrected claims, or initiating an appeal.

Electronic Claim Submission

The Health Insurance Portability and Accountability Act (HIPAA) mandates the use of standard electronic transactions (ASC X12 837) for claims. Clearinghouses convert non-standard formats. Advantages include fewer days in accounts receivable (AR), less paper handling, and real-time status updates.^[3]

Paper Claims Submission

Though declining, paper CMS-1500 claims are still used by some small practices or for specific payers. They must be typed (no hand corrections), stapled to supporting documentation, and mailed to the correct payer address. Submission delays are common.

Typical Claim Denial Causes and Patterns

Exams frequently test the most common reasons for claim rejection or denial. The MA’s role includes identifying and correcting these before submission (prevention) and after denial (remediation).

• Coding Errors: Incorrect ICD-10 code, mismatched diagnosis/procedure (e.g., code for a female condition on a male patient), missing modifier, or unbundling of procedures.
• Invalid Diagnosis Code: Using a code that does not support medical necessity for the procedure performed. Payers audit for this.
• Duplicate Claims: Same service submitted more than once. Use claim numbers to track.
• Coordination of Benefits (COB) Errors: Billing the wrong payer first; failure to list the primary payer ID.
• Missing or Incorrect Patient Information: Wrong date of birth, policy number, or spelling of name that does not match the insurance card.
• Timely Filing Denial: Claim submitted after the payer’s deadline (typically 90 days to 1 year from date of service).
• Non-covered Service: Service not a benefit of the plan (e.g., cosmetic procedures).

Strategies for Appealing Denied Claims

When a claim is denied, the MA must take corrective action. The appeal process is a critical skill tested on the CMA (AAMA) exam.^[4]

1. Review the Remittance Advice: Identify the denial reason code (e.g., CO-11, PR-45). Use a payer-specific denial log.
2. Determine the Correct Action: If the denial is due to a code error, correct the claim and resubmit electronically or via paper with a corrected claim form. If it is a medical necessity denial, gather supporting documentation (progress notes, test results) and write an appeal letter.
3. Write the Appeal Letter: Include the patient’s name, date of service, claim number, original and corrected code (if applicable), reason for billing, and citation of the medical policy. Send to the payer’s appeals address within the stated timeframe (often 60–180 days).
4. Track All Actions: Log the date of resubmission or appeal, the person contacted, and the outcome. Use a claims management software or spreadsheet.

Patient Billing After Insurance Payment

After adjudication, the remaining patient responsibility (deductible, copay, coinsurance, or non-covered amounts) is invoiced. The MA should issue an itemized statement and offer payment plans if necessary. Compliance with the No Surprises Act (effective 2022) requires transparency in billing for out-of-network services.^[5]

Critical Compliance and Risk Factors

• HIPAA Privacy and Security: Claims contain protected health information (PHI). Never share patient insurance information with unauthorized persons. Transmit electronic claims using encrypted connections.
• Fraud and Abuse: Upcoding, unbundling, or billing for services not rendered constitutes fraud. MAs must never knowingly submit false claims. Compliance programs are mandated for Medicare providers.^[6]
• Timely Filing Risks: Delays in claim submission lead to denial and lost revenue. Daily submission of electronic claims is best practice.
• Clearinghouse Errors: If the clearinghouse mishandles the claim (e.g., truncates a code), the provider is still responsible. Regularly monitor rejection reports and correct within 24 hours.

Essential Test-Prep Strategies for Claims

• Memorize the CMS-1500 as the standard claim form for professional services (physicians, MAs, therapists) and the UB-04 for hospital/institutional services.
• Remember the “five C’s” of a clean claim: Complete, Correct, Clean, Concise, and Compliant.
• Commonly tested denial codes: CO (Contractual Obligation), PR (Patient Responsibility), OA (Other Adjustment). Know that CO denials are often non-appealable; PR denials may be billed to the patient.
• Know that the clearinghouse step is not mandatory but is used by most practices to reduce administrative burden and improve claim accuracy.
• On the exam, you may be asked to sequence the steps: always start with collecting correct patient information and end with payment posting.
• Quick memory aid for submitting a corrected claim: CORRECT = Code correction, Original claim number, Reason for change, Resubmission date, ERA attached (if available), Transmit to same payer.
• Know the difference between “rejected” (claim never entered payer system; fix and resubmit) and “denied” (claim entered but not paid; may require appeal).

References

1. Bonewit-West, K., Hunt, S., & Appleton, E. (2020). The Medical Assistant: Administrative and Clinical Competencies (15th ed.). Cengage Learning. https://www.cengage.com/c/the-medical-assistant-administrative-and-clinical-competencies-15e-bonewit-west/9780357343509/
2. American Academy of Professional Coders (AAPC). (2024). Medical Billing: The Complete Guide to Claims Processing. https://www.aapc.com/resources/medical-billing-claims-processing.aspx
3. Centers for Medicare & Medicaid Services (CMS). (2023). HIPAA Administrative Simplification: Electronic Transaction Standards. https://www.cms.gov/Regulations-and-Guidance/Administrative-Simplification/ElectronicBillingEDITrans/Transactions
4. Nuss, M. A. (2021). Medical Assisting: Administrative and Clinical Competencies (8th ed.). Cengage Learning. https://www.cengage.com/c/medical-assisting-administrative-and-clinical-competencies-8e-nuss/9780357489818/
5. Centers for Medicare & Medicaid Services (CMS). (2022). No Surprises Act: Good Faith Estimate for Health Care Providers. https://www.cms.gov/nosurprises
6. U.S. Department of Health and Human Services, Office of Inspector General. (2023). Fraud & Abuse Laws. https://oig.hhs.gov/compliance/fraud-abuse-laws/