Two free Chrome extensions for healthcare professionals

Stop toggling between government websites. Start coding.

Instant ICD-10, CPT, NPI lookups and CARC/RARC denial code resolution — right inside your browser. Free. No account required.

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Chrome Web Store Zero patient data collected 660+ automated tests Free government data sources

The average biller toggles between 6 websites to resolve a single denied claim

CMS for fee schedules. NLM for ICD-10 codes. NPPES for NPI lookups. X12 for CARC and RARC denial codes. Then back to the billing system. Every tab switch is time lost and revenue delayed.

12–15%
Average claim denial rate across specialties in 2025
$25–181
Cost to rework a single denied claim
800K+
Medical coding & billing professionals in the US
Two tools, one mission

Everything you need to code accurately and resolve denials fast

Both extensions are free, privacy-first, and built on official US Government data sources.

MedCode Pro

Medical Coding & Billing Intelligence

Search ICD-10, CPT, HCPCS codes and NPI providers instantly. Build coding sessions with real-time NCCI validation, MUE checks, and a live Claim Health Score.

  • ICD-10-CM, CPT, HCPCS code search with smart type detection
  • NPI provider lookup with OIG exclusion flagging
  • NCCI edit checking with 2.3M+ CMS records & modifier explanations
  • Coding Workspace with 6 validators & Claim Health Score
  • Medicare fee schedule with locality-specific rates
  • Right-click & side panel — use alongside your EHR
Free100 lookups/day · No account required
Add MedCode Pro to Chrome

Denial Decoder

CARC & RARC Denial Code Lookup for Medical Billing

Decode any claim denial code in seconds. Plain-English explanations, soft vs. hard classification, and group code details — free forever. Upgrade to Pro for root cause analysis, resolution workflows, and appeal templates.

  • Full CARC & RARC lookup — every claim adjustment reason code decoded
  • Plain-English explanations of what the denial actually means
  • Soft/hard denial classification so you know whether to resubmit or appeal
  • Group code details — CO, PR, OA, PI, CR explained in context
  • 25 lookups/day with last 5 lookup history
  • Pro from $29/mo — root causes, resolution steps, appeal templates, unlimited lookups
Free25 lookups/day · No account required
Add Denial Decoder to Chrome
Denial Decoder

Got a denied claim? Decode it in seconds, not hours.

Every biller knows the frustration: you open an ERA, see CO-16 or PR-96, and start digging through payer websites for answers. Denial Decoder puts every CARC and RARC code at your fingertips — free plain-English explanations and soft/hard classification on every lookup. Upgrade to Pro for root cause analysis, step-by-step resolution workflows, and 20 appeal letter templates.

CO-16
Claim lacks information or has billing errors
CO-45
Charge exceeds fee schedule / max allowable
CO-97
Bundled — already included in another service
PR-96
Non-covered charge per plan provisions
CO-50
Medical necessity — not deemed necessary
CO-29
Timely filing limit exceeded
Denial Decoder
CO-16
CARC 16Soft Denial
Claim/service lacks information or has submission/billing error(s).
The payer is saying something is missing or incorrect on this claim. Check the RARC that came with it — it'll tell you exactly what's missing.
Resolution Steps PRO
  • 1Read the accompanying RARC for specifics
  • 2Verify patient demographics & insurance info
  • 3Check for missing modifiers, referrals, or auth numbers
  • 4Correct and resubmit — no appeal needed
Related RARCs
MA36MA130N130N517
How it works

From install to insight in under 30 seconds

1

Add to Chrome

Click "Add to Chrome" on either extension. No account, no credit card, no IT department approval needed.

2

Search anything

Type a code like E11.65, 99213, CO-16, or a keyword like "timely filing." Smart detection figures out the rest.

3

Get instant answers

Descriptions, validation results, denial explanations, resolution steps, and appeal templates — in milliseconds.

Built for trust. Designed for compliance.

Both extensions share the same Zero-PHI security architecture. No patient data. No tracking. No risk.

Zero-PHI Architecture

Cannot read EHR screens, clipboard, or page content. No patient data ever collected, stored, or transmitted.

No BAA Required

HIPAA doesn't apply because there's no PHI to protect. No analytics, no advertising scripts, no telemetry.

Government Data Sources

All data from free public US government APIs: NLM, CMS, NPPES, RxNorm, and official X12 code standards.

Open & Testable

Open source on GitHub. 660+ automated tests. Local-only storage — uninstall and everything is gone.

Built for the people who keep healthcare revenue moving

📋

Medical Coders

CPC, CCS, CRC certified professionals

💰

Medical Billers

Claims submission & denial management

📊

Revenue Cycle Managers

A/R optimization & denial reduction

✅

Compliance Officers

NCCI validation & audit readiness

🩺

CDI Specialists

Clinical documentation improvement

🏥

Practice Managers

Provider credentialing & operations

🔍

Coding Auditors

Pre- and post-payment audit review

🏢

RCM Companies

Outsourced billing & coding operations

Start free. Upgrade when you're ready.

Both tools work immediately with no signup. MedCode Pro offers paid plans for power users who need more.

MedCode Pro

Medical Coding & Billing Intelligence
$0
Free tier — no credit card required
  • 100 code lookups per day
  • Unlimited NPI lookups
  • 100 NCCI checks per day
  • 1 workspace with 3 codes
  • Paid plans from $14.99/mo

Denial Decoder

CARC & RARC Denial Code Lookup
$0
Free forever — for individual billers
  • Full CARC & RARC code lookup
  • Plain-English explanations
  • Soft/hard classification & group codes
  • 25 lookups per day
  • Pro from $29/mo — root causes, resolution steps, appeal templates & unlimited lookups
MedCode Pro pricing & plans | Denial Decoder pricing & plans

Your codes. Your claims. Decoded.

Join healthcare professionals who stopped wasting time on government websites.

Get MedCode Pro — Free Get Denial Decoder — Free