Who has to pay after a code 61 denial?

Who owes depends on the details. The letters in front of the number matter: CO (contractual obligation) usually means an in-network provider must absorb it, while PR (patient responsibility) means the plan says you owe it.

How long do I have to appeal?

It depends on your coverage: 180 days for most employer and marketplace plans, 120 days for Original Medicare, about 90 days for Medicaid (varies by state), and only 65 days for Medicare Advantage. Set your deadline clock before you do anything else.

All denial codes · code 61

Denial code 61: what it means — and how to fight it

Denial code 61 (shown on your EOB as CO-61 or PR-61) means: “Adjusted for failure to obtain second surgical opinion.” In plain English: Your plan required a second doctor to agree the surgery was needed, and that opinion was not on file before the operation.

medium appealability Who owes depends on the details

What they're really saying

“Adjusted for failure to obtain second surgical opinion.”

Your plan required a second doctor to agree the surgery was needed, and that opinion was not on file before the operation.

Your odds

Worth fighting — many of these get fixed.

Often reduced or reversed if the surgery was urgent or the requirement was never disclosed to you.

Fewer than 1 in 100 denied claims are ever appealed. When people do appeal, roughly 4 in 10 win the first round — and independent external review overturns 40–50% of what reaches it.

How to appeal a code 61 denial

Decode. You just did — this page is step one.
Set your clock. 180 days for most employer and marketplace plans, 120 for Original Medicare, ~90 for Medicaid, only 65 for Medicare Advantage.
Urgent? If this is care you still need, call and request an expedited appeal — they must decide within 72 hours.
Look up "second surgical opinion" in your plan's Summary of Benefits and Coverage. Check your plan documents for the second-opinion rule and whether emergencies are exempt. If the surgery could not wait, get a letter from the surgeon saying so. If nobody told you the rule existed, say that in the appeal and ask for the disclosure they claim was given.
Send it certified. Letter plus evidence, keep copies of everything.
Escalate. Denied again? Independent external review — a doctor who doesn't work for your insurer decides.

Do it in minutes, free

The AppealClock tool translates your denial, drafts your appeal letter, computes your exact deadline — and watches the clock so you don't have to. No account. Your medical details never leave your device.

Start your appeal & set your clock →

Common questions

What does denial code 61 mean?: Your plan required a second doctor to agree the surgery was needed, and that opinion was not on file before the operation.
Can I appeal a CO-61 or PR-61 denial?: Yes. Appealing is free and it is your legal right. For this code the odds are medium: Often reduced or reversed if the surgery was urgent or the requirement was never disclosed to you. Fewer than 1 in 100 denials are ever appealed — insurers count on silence.
Who has to pay after a code 61 denial?: Who owes depends on the details. The letters in front of the number matter: CO (contractual obligation) usually means an in-network provider must absorb it, while PR (patient responsibility) means the plan says you owe it.
How long do I have to appeal?: It depends on your coverage: 180 days for most employer and marketplace plans, 120 days for Original Medicare, about 90 days for Medicaid (varies by state), and only 65 days for Medicare Advantage. Set your deadline clock before you do anything else.