Health insurance denial & claim adjustment codes

What health insurance denial code 151 means on your EOB

The plan cut the number of visits or units it will pay for. Frequency limits are often plan policy rather than clinical judgment.

What usually causes it

• A visit or unit cap was reached.
• Frequency exceeded the plan's published limit.
• Medical necessity for the additional units was not documented.

The documents that decide it

• The plan's frequency limit for this service.
• The units billed versus paid.
• Clinical justification for the additional units.

What to do next

If a cap was applied, ask whether a medical-necessity exception exists. Ask whether yours does — it's easy never to ask.

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.