Who has to pay after a code 204 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 204 · CO-204 / PR-204 · translated

Denial code 204: what it means — and how to fight it

Denial code 204 (shown on your EOB as CO-204 or PR-204) means: “This service/equipment/drug is not covered under the patient's current benefit plan.” In plain English: A flat "your plan doesn't include this." Sometimes true — sometimes they're reading the wrong plan.

medium appealability Who owes depends on the details

What they're really saying

“This service/equipment/drug is not covered under the patient's current benefit plan.”

A flat "your plan doesn't include this." Sometimes true — sometimes they're reading the wrong plan.

Your odds

Worth fighting — many of these get fixed.

Wins when the exclusion doesn't actually exist or a formulary exception applies.

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 204 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.
Find the exclusion in your actual plan document — or make them show it. Demand the exact exclusion language. For drugs: formulary exception process with physician support. Check for essential-health-benefit violations.
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 204 mean?: A flat "your plan doesn't include this." Sometimes true — sometimes they're reading the wrong plan.
Can I appeal a CO-204 or PR-204 denial?: Yes. Appealing is free and it is your legal right. For this code the odds are medium: Wins when the exclusion doesn't actually exist or a formulary exception applies. Fewer than 1 in 100 denials are ever appealed — insurers count on silence.
Who has to pay after a code 204 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.