Who has to pay after a code 258 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 258

Denial code 258: what it means — and how to fight it

Denial code 258 (shown on your EOB as CO-258 or PR-258) means: “Claim/service not covered when patient is in custody/incarcerated. Applicable federal, state or local authority may cover the claim/service.” In plain English: The plan says you were in jail or prison when you got care, so the correctional system should pay instead.

high appealability Who owes depends on the details

What they're really saying

“Claim/service not covered when patient is in custody/incarcerated. Applicable federal, state or local authority may cover the claim/service.”

The plan says you were in jail or prison when you got care, so the correctional system should pay instead.

Your odds

Strong — this type of denial has real weaknesses.

Frequently reversed, because these flags are often outdated or attached to the wrong person.

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 258 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.
Tell the plan in writing whether you were actually in custody on that date and ask for their source. If you were not incarcerated on that date, say so in writing and ask the plan to show its source. These flags come from government data files and are wrong more often than people expect, sometimes lingering long after release. If you were in custody, ask the facility's medical unit about their payment process — outside care during custody is often their obligation.
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 258 mean?: The plan says you were in jail or prison when you got care, so the correctional system should pay instead.
Can I appeal a CO-258 or PR-258 denial?: Yes. Appealing is free and it is your legal right. For this code the odds are high: Frequently reversed, because these flags are often outdated or attached to the wrong person. Fewer than 1 in 100 denials are ever appealed — insurers count on silence.
Who has to pay after a code 258 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.