Decode denials and draft appeals
Paste an EOB or denial letter — River explains the denial, identifies next steps, and drafts your appeal.
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River's Denial & EOB Decoder analyzes insurance denials and explanations of benefits (EOBs), explains denial reason codes in plain language, and drafts appeal letters ready for submission. Paste the denial or EOB text and select what you need — a plain-English explanation, step-by-step next steps, a full appeal draft, or a staff task checklist. The AI identifies the denial category, interprets CARC/RARC codes, and determines the best path to resolution.
Medical billing denials cost practices thousands of dollars and hours each month. Most denials are overturnable with the right appeal, but writing appeals takes time physicians and billers don't have. This tool helps you decode what actually happened, decide whether to appeal or resubmit, and generate a professional appeal letter in minutes.
This tool is perfect for medical billers working claim queues, physicians who received unexpected denials, practice managers reviewing denial trends, or anyone who needs to understand or respond to an insurance denial quickly and correctly.
How Insurance Denials Work
Insurance denials fall into several categories: clinical denials (medical necessity, lack of prior auth, experimental), administrative denials (timely filing, missing information, eligibility), coding denials (incorrect CPT/ICD-10, bundling), and coverage denials (not a covered benefit, plan exclusion). The denial category determines the response strategy — clinical denials require clinical documentation, administrative denials require procedural corrections.
CARC codes (Claim Adjustment Reason Codes) and RARC codes (Remittance Advice Remark Codes) are standardized codes payers use to explain the denial on the ERA/EOB. Understanding these codes is essential for determining the right response. Common CARC codes: CO-4 (service inconsistent with prior service on same day), CO-11 (diagnosis inconsistent with procedure), CO-96 (non-covered charge), PR-1 (deductible), CO-29 (timely filing).
Appeals must be filed within the payer's appeal window — typically 60-180 days from the denial date. Most denials have a first-level and second-level appeal, and some payers offer an external independent review. Document every appeal submission with date, method of submission, and confirmation number. Track denial and appeal rates by payer, code, and provider to identify systemic issues.
What You Get
Plain-language explanation of the denial reason and category
Recommended action: appeal, resubmit, correct, or write off
Complete appeal letter draft ready for submission
Staff task checklist with roles and timeline
Supporting documentation checklist
Tailored for biller, physician, patient, or practice owner
How It Works
- 1Paste the denial or EOBCopy the denial letter, EOB text, or remittance advice into the input
- 2Select your outputChoose explanation, next steps, appeal draft, or staff checklist
- 3AI analyzes and generatesRiver identifies denial codes, interprets the denial, and generates your output
- 4Review and submitReview the output, add specific clinical details if needed, and submit the appeal
Frequently Asked Questions
Can this tool read the actual CARC/RARC codes?
Yes. If your EOB or ERA includes CARC/RARC codes (e.g. CO-29, PR-2, N479), the AI identifies and interprets them automatically. If the codes aren't visible in the text you paste, paste the full denial letter text and the AI will infer the denial category from the language.
How accurate are the generated appeal letters?
The appeal letter provides a strong starting point based on the denial information you provide. You should review and add specific clinical documentation details, patient-specific facts, and any prior authorization information before submitting. The more detail you include in the input (prior auth numbers, clinical rationale, prior treatment history), the stronger the appeal.
Does this work for all payers?
Yes — the denial analysis and appeal framework works for Medicare, Medicaid, and commercial payers. For Medicare-specific denials (LCD, NCD), the AI notes the relevant coverage determination. For state Medicaid, payer-specific appeal procedures vary, so verify timelines and submission methods with your payer.
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