Health insurance denial & claim adjustment codes

What health insurance denial code 233 means on your EOB

The plan is refusing to pay for harm it considers preventable. You generally cannot be billed for these.

What usually causes it

• A hospital-acquired condition was identified.
• A preventable error was coded.
• The event met the plan's never-event definition.

The documents that decide it

• The EOB carrying this code.
• Any bill you received.
• The facility's statement.

What to do next

This is explicitly not billable to you in most circumstances. If you have received a bill, that is the finding worth pursuing.

This page explains what a code means. It is information, not advice — it does not tell you whether your specific claim should have been paid, and it is not legal, medical, or insurance advice. Your plan documents and your denial notice govern your situation.