Health insurance denial & claim adjustment codes

What health insurance denial code 177 means on your EOB

A program-eligibility denial rather than a coverage decision. The plan or program says you did not meet its qualifying requirements on that date, which most often turns on income, household size, or a renewal document that was never processed.

What usually causes it

• Income or household size was recorded wrongly.
• A required document was not submitted.
• Eligibility lapsed at renewal.

The documents that decide it

• Your eligibility notice.
• Your actual income and household size.
• Any renewal paperwork.

What to do next

Eligibility denials often turn on outdated income or household data. A correction can restore coverage retroactively in many programs.

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.