Who has to pay after a code 38 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 38

Denial code 38: what it means — and how to fight it

Denial code 38 (shown on your EOB as CO-38 or PR-38) means: “Services not provided or authorized by designated (network/primary care) providers.” In plain English: They say this wasn't done by an approved or referred provider. Emergencies are exempt, and referral gaps are often the plan's or provider's error.

high appealability Who owes depends on the details

What they're really saying

“Services not provided or authorized by designated (network/primary care) providers.”

They say this wasn't done by an approved or referred provider. Emergencies are exempt, and referral gaps are often the plan's or provider's error.

Your odds

Strong — this type of denial has real weaknesses.

Emergency and retro-referral arguments overturn many of these.

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 38 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.
Was it an emergency, or did you have a referral? Say so in writing. For emergencies, cite the prudent-layperson standard — no referral needed. Otherwise request a retroactive referral/authorization and argue an administrative gap shouldn't fall on the patient.
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 38 mean?: They say this wasn't done by an approved or referred provider. Emergencies are exempt, and referral gaps are often the plan's or provider's error.
Can I appeal a CO-38 or PR-38 denial?: Yes. Appealing is free and it is your legal right. For this code the odds are high: Emergency and retro-referral arguments overturn many of these. Fewer than 1 in 100 denials are ever appealed — insurers count on silence.
Who has to pay after a code 38 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.