Health insurance denial & claim adjustment codes

What health insurance denial code 210 means on your EOB

Authorization was requested, but the plan says it came too late. Timeliness rules vary by plan, and many carve out emergencies and retroactive eligibility.

What usually causes it

• The request arrived after the plan's pre-service deadline.
• The care was urgent or emergent, which often suspends the requirement.
• Coverage was applied retroactively, making advance notice impossible.

The documents that decide it

• The date the request was submitted.
• The plan's stated timeliness requirement.
• Documentation of urgency or retroactive eligibility, if either applies.

What to do next

If the care was emergent or your coverage was retroactive, say so explicitly in the appeal — these are named exceptions in most plan documents rather than discretionary favors.

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.