Who has to pay after a code 158 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 158

Denial code 158: what it means — and how to fight it

Denial code 158 (shown on your EOB as CO-158 or PR-158) means: “Service/procedure was provided outside of the United States.” In plain English: You got care in another country and the plan does not cover it, or covers it only in emergencies.

medium appealability Who owes depends on the details

What they're really saying

“Service/procedure was provided outside of the United States.”

You got care in another country and the plan does not cover it, or covers it only in emergencies.

Your odds

Worth fighting — many of these get fixed.

Emergency care abroad is covered by many plans; routine care abroad usually is not. Original Medicare almost never covers it.

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 158 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.
Get an itemized, English-translated bill with the date and currency conversion. Read the travel or foreign-care section of your plan documents. If it was an emergency, submit an itemized bill translated into English with amounts in US dollars plus the exchange rate for that date, and a note explaining why it could not wait until you returned. Some Medicare Advantage plans include worldwide emergency coverage even though Original Medicare does not.
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 158 mean?: You got care in another country and the plan does not cover it, or covers it only in emergencies.
Can I appeal a CO-158 or PR-158 denial?: Yes. Appealing is free and it is your legal right. For this code the odds are medium: Emergency care abroad is covered by many plans; routine care abroad usually is not. Original Medicare almost never covers it. Fewer than 1 in 100 denials are ever appealed — insurers count on silence.
Who has to pay after a code 158 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.