What you paid versus what you owed: the simplest refund check

This is one of the most reliably profitable checks in medical billing, and one of the simplest.

Compare what you actually paid against what the finished claim says you owed. When the first is larger, the difference is your money sitting in someone else's account.

It works because of a timing mismatch built into the system. You often pay before the number exists: a deposit before a procedure, the full price at a counter, an estimate at check in. Then the insurer adjudicates and sets a smaller number. Nothing in the process circles back to tell you.

Where the money hides:

• One bill paid twice, through two channels.
• A deposit or estimate that was never reconciled against the final EOB.
• A copay collected at the desk and then billed again a month later.

Run this check on bills you have already paid, and especially on statements showing a zero balance. A zero balance means the provider considers the account settled at the amount they charged. It says nothing about whether that amount was right.

Then follow up. A refund you identified is worth nothing until it arrives. Give it about thirty days and chase it, because credit balances almost never move on their own.

General information, not legal, medical or financial advice. Every plan is different, so check the details against your own plan documents.