No PHI collected Fast lookup Official sources

Medical billing lookup,
built for RCM teams

Search ICD-10-CM diagnosis codes, CARC/RARC denial codes, and the NPI registry — free, fast, and privacy-first.

Lookup tools

Everything you need for coding and claim research

ICD-10-CM Lookup

Search ~98,000 diagnosis codes by code or description. Filter billable codes and view category context.

98,186 codes Open tool

Denial Codes

CARC and RARC codes with full official descriptions for claim adjustment and remittance research.

1,136 codes Open tool

NPI Registry

Live search of the CMS NPPES registry by NPI, name, organization, location, or taxonomy.

Live API Open tool

Built for professionals

  • Fast, flexible search
    Exact, partial, starts-with, description, and code-only matching with autocomplete.
  • Favorites & history
    Save codes you use often and revisit recent searches from your dashboard.
  • Privacy-first
    No PHI is collected, stored, or transmitted. NPI queries are not cached.

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Unlock favorites, search history, and a personal dashboard.

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