Health insurance denial & claim adjustment codes

What health insurance denial code 15 means on your EOB

Usually a billing-side defect rather than a coverage decision. These frequently resolve on corrected resubmission without any formal appeal.

What usually causes it

• The authorization number was omitted from the claim.
• The number was mistyped or formatted wrongly.
• The number belongs to a different service.

The documents that decide it

• The claim as submitted.
• The correct authorization number.
• The provider's billing record.

What to do next

This is almost always the provider's to fix. Ask them to correct and resubmit before you spend an appeal on it.

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.