Health insurance denial & claim adjustment codes

What health insurance denial code N877 means on your EOB

A No Surprises Act remark code. It tells you this payment falls under the federal law, and a federal dispute path opens after an open-negotiation period.

What usually causes it

• The care was out-of-network at an in-network facility, or emergency care.
• The plan made an initial payment under the federal standard.
• A 30-day open negotiation period applies before federal dispute resolution.

The documents that decide it

• Your EOB carrying this remark code.
• The facility's network status.
• Whether you signed any notice-and-consent form.

What to do next

You generally cannot be balance-billed for care covered by this code. If you receive a bill beyond your EOB's patient-responsibility amount, that is the finding.

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.