Free tool

Denial Decoder

Paste the reason from your denial letter or Explanation of Benefits. Get what it means, your deadline, and your appeal rights in plain English. Runs in your browser; nothing you paste is stored.

Paste the denial reasonFrom your denial letter or Explanation of Benefits, including any codes like CO-50 or PR-204. It stays in your browser: we never store or send it.

Your coverage

Date on the denial notice

General information about published appeal rules, not legal or medical advice. Your plan documents and the dates on your notice control.