Everything You Need to
Code with Confidence
29,853 ICD-10 codes, 13,378 CPT procedures, 1,065 LCDs, 357 NCDs, and AI-assisted review tools — all free, no account required.
Search Everything
Type any ICD-10 code, CPT procedure, or medical condition into the search bar — or ask Octo AI a question in plain English. The unified search is on every page and handles codes, names, and natural language queries.
Explore & Analyze
Drill into any diagnosis or procedure to see billable status, real Medicare payment data, DRG inpatient payments, coding guidance, and related conditions. Browse 21 chapters of ICD-10 codes or the top 200 CPT procedures by volume.
Validate & Automate
Check ICD-10 code combinations for Excludes1/Excludes2 conflicts, look up CARC/RARC denial codes, or upload documents for an AI-powered Prior Authorization or Claims Appeal review. The AI agent extracts clinical evidence, validates codes against CMS fee schedules, and cross-references coverage policies — all automatically.
What You Can Do
Every feature is built for one purpose — helping you find, validate, and understand medical codes faster.
Browse All Codes
29,853 ICD-10 codes organized by chapter with billable status at a glance. 13,378 CPT/HCPCS procedures ranked by Medicare volume. Every code links to its full detail page.
Browse DiagnosesKnow the Payments
Real CMS Medicare payment data on every billable code — not estimates. See national average facility and non-facility rates for procedures, and DRG inpatient payment breakdowns for diagnoses.
View ProceduresAsk Octo AI
Ask any coding question in plain English — "What's the code for abdominal pain left side?" or "Extract billable codes from this note." Octo can process pasted clinical notes and even uploaded PDFs and images. Accessible from every page via the bottom bar or Cmd+K.
Code with Confidence
The Excludes Conflict Checker catches Excludes1 and Excludes2 issues between any combination of ICD-10 codes. Each diagnosis page includes coding guidance, additional info from parent codes, and links to related conditions.
Check ConflictsCoverage Database
Browse the full CMS Medicare Coverage Database — 1,065 Local Coverage Determinations (LCDs) and 357 National Coverage Determinations (NCDs). Search LCDs by CPT code for facility-specific medical necessity criteria, view full policy details including ICD-10 coverage mappings, indications, and documentation requirements.
Browse PoliciesPrior Authorization Review
Upload a prior authorization request and supporting records. The AI agent extracts clinical evidence, validates provider credentials and CPT/ICD-10 codes, checks CMS physician fee schedules, and cross-references relevant LCDs and NCDs. Generates a structured report with coverage findings and documentation gap analysis — no binary APPROVE/DENY, only Flag for Review.
Review PAClaims Appeal Review
Upload a denial letter and medical records. The AI agent decodes CARC/RARC denial reasons, validates the denied codes against fee schedules and coverage policies, and identifies missing documentation or clinical evidence gaps. Generates a structured appeal review report with denial analysis and actionable findings.
Analyze AppealDenial Code Lookup
Browse and search 5,700+ Claim Adjustment Reason Codes (CARC) and Remittance Advice Remark Codes (RARC) — the standard denial codes used in every healthcare claim remittance advice. Filter by status (Current, To Be Deactivated, Deactivated) and expand each code for detailed metadata including start dates and CMS notes.
Look Up CodesHow the AI Review Agent Works
Both the Prior Authorization and Claims Appeal tools use a purpose-built AI agent with real-time access to CMS data.
Agent Workflow
- 1. Upload Documents
Upload the prior auth request or denial letter plus supporting medical records (PDFs, images). The agent extracts text content from every file.
- 2. Extract Clinical Evidence
The agent reads all clinical documentation — imaging reports, lab results, procedure notes — and summarizes the relevant clinical findings before looking up any policies.
- 3. Validate Provider and Codes
Provider credentials, CPT procedure codes, and ICD-10 diagnosis codes are validated against CMS data. Codes not found in the fee schedule are noted — not falsely flagged as invalid.
- 4. Check Fee Schedules
Each CPT code is looked up in the CMS Physician Fee Schedule to verify it exists and to surface national average payment rates.
- 5. Look Up Coverage Policies
Matching Local Coverage Determinations (LCDs) and National Coverage Determinations (NCDs) are retrieved. The agent reads medical necessity criteria, indications, and documentation requirements.
- 6. Analyze Documentation Gaps
The agent compares clinical evidence against policy requirements and flags missing documentation — without making binary approval or denial determinations.
- 7. Generate Structured Report
A comprehensive markdown report is generated with sections for clinical summary, code validation, fee schedule findings, coverage analysis, documentation gaps, and audit trail.
By the Numbers
29,853
ICD-10 Codes Indexed
13,378
CPT/HCPCS Procedures
9,360
Conditions with Guidance
1,065
Local Coverage Determinations
357
National Coverage Determinations
5,700+
Denial Codes (CARC/RARC)
100%
Free. No Account. No Upsell.
Who Uses This
Built for everyone who touches medical codes — from the front desk to the OR.
Medical Coders
Validate code combinations, look up payment data, and catch Excludes conflicts before claims go out.
Clinicians
Quickly find the right diagnosis code, check documentation requirements, and stay current with coding guidance.
Billing Staff
Research Medicare payment rates, verify billable status, and ensure clean claims with the Conflict Checker.
Students
Learn ICD-10 and CPT coding with real-world data, browse chapter structure, and understand DRG payment logic.
Start Searching
No sign-up, no credit card, no upsells. Just instant access to the most comprehensive free medical coding reference on the web.