Health insurance denial & claim adjustment codes

What health insurance denial code 56 means on your EOB

A close cousin of the experimental denial. The dispute is over the evidence base the plan applied and whether newer evidence exists.

What usually causes it

• The plan's effectiveness standard is stricter than the specialty consensus.
• The policy has not been revised since newer trials published.
• The service was coded in a way that triggered the wrong policy.

The documents that decide it

• The plan's policy and its revision date.
• Current specialty-society guidance.
• Your provider's clinical rationale.

What to do next

Same path as an experimental denial: request the policy, then escalate to external review where an independent reviewer applies the evidence.

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.