Who has to pay after a code 35 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.

Denial code 35 · CO-35 / PR-35 · translated

Denial code 35: what it means — and how to fight it

Denial code 35 (shown on your EOB as CO-35 or PR-35) means: “Lifetime benefit maximum has been reached.” In plain English: They say you've used up a lifetime cap. For essential health benefits, lifetime dollar caps are illegal under the ACA.

high appealability Who owes depends on the details

What they're really saying

“Lifetime benefit maximum has been reached.”

They say you've used up a lifetime cap. For essential health benefits, lifetime dollar caps are illegal under the ACA.

Your odds

Strong — this type of denial has real weaknesses.

ACA banned lifetime dollar limits on essential benefits — many of these denials are simply unlawful.

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 35 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.
Ask whether this cap is a dollar limit on an essential health benefit — if yes, it's likely illegal. If the service is an essential health benefit and your plan is ACA-regulated, cite the ACA's lifetime-limit prohibition. Demand the plan language and the math behind the cap.
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 35 mean?: They say you've used up a lifetime cap. For essential health benefits, lifetime dollar caps are illegal under the ACA.
Can I appeal a CO-35 or PR-35 denial?: Yes. Appealing is free and it is your legal right. For this code the odds are high: ACA banned lifetime dollar limits on essential benefits — many of these denials are simply unlawful. Fewer than 1 in 100 denials are ever appealed — insurers count on silence.
Who has to pay after a code 35 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.