Instant CARC & RARC denial code lookup with plain-English explanations, root causes, resolution steps, and appeal templates. Free for healthcare billers and coders.
Type a CARC or RARC code, keyword, or description. Results appear instantly from 1,520 bundled codes.
Get the plain-English explanation, root causes, and soft vs hard classification for every denial code.
Follow resolution steps, copy appeal letters, and route to the right team to get claims paid.
From code lookup to appeal letter — Denial Decoder covers the full denial resolution workflow.
Search all 407 CARC and 1,113 RARC codes. Official X12 descriptions plus group code classification (CO, PR, OA, PI, CR).
Every denial code translated into clear language. No more guessing what “Charge exceeds fee schedule/maximum allowable” means.
Common root causes for each denial with team routing. Know whether to call the payer, fix billing, or update coding.
Step-by-step resolution workflows with department routing. Payer Contracting, Clinical Coding, A/R Follow-Up, or Patient Facing.
20 ready-to-use appeal letter templates with required attachments checklists and filing deadlines.
Quick reference for the most common denial codes. See patterns at a glance and stay ahead of recurring issues.
| Feature | Free | Pro |
|---|---|---|
| Code Lookup (CARC/RARC/CAGC) | Full | Full |
| Plain-English Explanations | Full | Full |
| Soft/Hard Classification | ||
| Root Cause Analysis | ||
| Resolution Steps | ||
| Appeal Templates (20) | ||
| Daily Lookups | 25/day | Unlimited |
| Lookup History | Last 5 | Unlimited |
Start free. Upgrade when your team needs more.
For individual billers
For power users
For billing departments
5 seats included
For large practices
15 seats included
All denial code data is sourced from official standards organizations — not scraped, not crowd-sourced, not AI-generated.
Official Claim Adjustment Reason Codes and Remittance Advice Remark Codes maintained by the X12 standards body.
Claim Adjustment Group Codes (CO, PR, OA, PI, CR) defining financial responsibility as specified by CMS.
CAQH Committee on Operating Rules for Information Exchange — standardized business scenario mappings for denial code combinations.
Denial Decoder has a zero-data-collection architecture. All 1,520 codes are bundled locally — zero network requests, zero analytics, zero PHI. Read the full privacy policy
Yes. The free tier gives you full code lookup for all 407 CARC and 1,113 RARC codes with plain-English explanations, soft/hard classification, and group code details. No account, no credit card, no time limit.
MedCode Pro handles medical coding (ICD-10, CPT, HCPCS, NPI) with NCCI validation and coding workspaces. Denial Decoder focuses specifically on denial code resolution — CARC/RARC lookup, root cause analysis, resolution workflows, and appeal letters. They're complementary tools.
Yes, 100%. All 1,520 denial codes are bundled into the extension at install time. Zero network requests are made during normal use. It works in airplane mode, behind strict firewalls, and in any environment.
Official CARC and RARC codes from X12.org, group code definitions from CMS, and business scenario mappings from CAQH CORE. All data is verified against authoritative sources and bundled at build time.
We're launching the free tier first to ensure it delivers genuine value. Pro, Team, and Practice tiers with root cause analysis, resolution steps, appeal templates, and team licensing will be available soon. The pricing shown reflects our planned pricing.
Denial Decoder collects zero data. No analytics, no tracking, no telemetry, no cookies. All storage is local to your device. The extension makes zero network requests. Read our privacy policy for complete details.
Join healthcare professionals who resolve denials faster with plain-English explanations and actionable resolution steps.
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